###Answer the question from the input provided. Please answer from input only.

###Input: In addition to those actors who have headlined the series, others have portrayed versions of the Doctor in guest roles. Notably, in 2013, John Hurt guest-starred as a hitherto unknown incarnation of the Doctor known as the War Doctor in the run-up to the show's 50th anniversary special "The Day of the Doctor". He is shown in mini-episode "The Night of the Doctor" to have been retroactively inserted into the show's fictional chronology between McGann and Eccleston's Doctors, although his introduction was written so as not to disturb the established numerical naming of the Doctors. Another example is from the 1986 serial The Trial of a Time Lord, where Michael Jayston portrayed the Valeyard, who is described as an amalgamation of the darker sides of the Doctor's nature, somewhere between his twelfth and final incarnation.

There have been instances of actors returning at later dates to reprise the role of their specific Doctor. In 1973's The Three Doctors, William Hartnell and Patrick Troughton returned alongside Jon Pertwee. For 1983's The Five Doctors, Troughton and Pertwee returned to star with Peter Davison, and Tom Baker appeared in previously unseen footage from the uncompleted Shada episode. For this episode, Richard Hurndall replaced William Hartnell. Patrick Troughton again returned in 1985's The Two Doctors with Colin Baker. In 2007, Peter Davison returned in the Children in Need short "Time Crash" alongside David Tennant, and most recently in 2013's 50th anniversary special episode, "The Day of the Doctor", David Tennant's Tenth Doctor appeared alongside Matt Smith as the Eleventh Doctor and John Hurt as the War Doctor, as well as brief footage from all of the previous actors. In addition, the Doctor has occasionally encountered himself in the form of his own incarnation, from the near future or past. The First Doctor encounters himself in the story The Space Museum (albeit frozen and as an exhibit), the Third Doctor encounters and interacts with himself in the story Day of the Daleks, the Fourth Doctor encounters and interacts with the future incarnation of himself (the 'Watcher') in the story Logopolis, the Ninth Doctor observes a former version of his current incarnation in "Father's Day", and the Eleventh Doctor briefly comes face to face with himself in "The Big Bang". In "The Almost People" the Doctor comes face-to-face with himself although it is found out that this incarnation is in fact just a flesh replica. In "The Name of the Doctor", the Eleventh Doctor meets an unknown incarnation of himself, whom he refers to as "his secret" and who is subsequently revealed to be the War Doctor.

Additionally, multiple Doctors have returned in new adventures together in audio dramas based on the series. Peter Davison, Colin Baker and Sylvester McCoy appeared together in the 1999 audio adventure The Sirens of Time. To celebrate the 40th anniversary in 2003, an audio drama titled Zagreus featuring Paul McGann, Colin Baker, Sylvester McCoy and Peter Davison was released with additional archive recordings of Jon Pertwee. Again in 2003, Colin Baker and Sylvester McCoy appeared together in the audio adventure Project: Lazarus. In 2010, Peter Davison, Colin Baker, Sylvester McCoy and Paul McGann came together again to star in the audio drama The Four Doctors.

Throughout the programme's long history, there have been revelations about the Doctor that have raised additional questions. In The Brain of Morbius (1976), it was hinted that the First Doctor may not have been the first incarnation (although the other faces depicted may have been incarnations of the Time Lord Morbius). In subsequent stories the First Doctor was depicted as the earliest incarnation of the Doctor. In Mawdryn Undead (1983), the Fifth Doctor explicitly confirmed that he was then currently in his fifth incarnation. Later that same year, during 1983's 20th Anniversary special The Five Doctors, the First Doctor enquires as to the Fifth Doctor's regeneration; when the Fifth Doctor confirms "Fourth", the First Doctor excitedly replies "Goodness me. So there are five of me now." In 2010, the Eleventh Doctor similarly calls himself "the Eleventh" in "The Lodger". In the 2013 episode "The Time of the Doctor," the Eleventh Doctor clarified he was the product of the twelfth regeneration, due to a previous incarnation which he chose not to count and one other aborted regeneration. The name Eleventh is still used for this incarnation; the same episode depicts the prophesied "Fall of the Eleventh" which had been trailed throughout the series.

The programme's first serial, An Unearthly Child, shows that the Doctor has a granddaughter, Susan Foreman. In the 1967 serial, Tomb of the Cybermen, when Victoria Waterfield doubts the Doctor can remember his family because of, "being so ancient", the Doctor says that he can when he really wants to—"The rest of the time they sleep in my mind". The 2005 series reveals that the Ninth Doctor thought he was the last surviving Time Lord, and that his home planet had been destroyed; in "The Empty Child" (2005), Dr. Constantine states that, "Before the war even began, I was a father and a grandfather. Now I am neither." The Doctor remarks in response, "Yeah, I know the feeling." In "Smith and Jones" (2007), when asked if he had a brother, he replied, "No, not any more." In both "Fear Her" (2006) and "The Doctor's Daughter" (2008), he states that he had, in the past, been a father.



###Question: Which three doctors were in The Sirens of Time?

###Answer: {'answer':'Peter Davison, Colin Baker and Sylvester McCoy'}