<prompt> Regarding obsessive compulsive disorder, which of the following is true?Most common obsession is obsession of contaminationMost common compulsion is compulsion of checkingObsession is a disorder of possession of thoughtAll the above are true  <response>: All the three statements are correct. Please remember that, obsessions are disorders of possession of thought. In some cases, possession is not in the option, in that scenario, the second best answer is, content of thought 