<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 24-year-old male graduate student comes to the physician for a two-month history of repeated thoughts and anxiety that he is going to be harmed by someone on the street. The anxiety worsened after witnessing a pedestrian getting hit by a car two weeks ago. He says, That was a warning sign. On his way to school, he now often leaves an hour earlier to take a detour and hide from people that he thinks might hurt him. He is burdened by his coursework and fears that his professors are meaning to fail him. He says his friends are concerned about him but that they do not understand because they were not present at the accident. The patient has no known history of psychiatric illness. On mental status exam, he is alert and oriented, and shows full range of affect. Thought processes and speech are organized. His memory and attention are within normal limits. He denies auditory, visual, or tactile hallucinations. Urine toxicology screening is negative. Which of the following is the most likely diagnosis in this patient?? A: Avoidant personality disorder, B: Schizotypal personality disorder, C: Delusional disorder, D: Generalized anxiety disorder, E: Schizoid personality disorder,  <response>: This is a clinical vignette describing a 24-year-old male with symptoms of anxiety, paranoia, and irrational fears that have developed over the past 2 months. The symptoms seem to have been triggered by witnessing a traumatic event - a pedestrian getting hit by a car. Since then, the patient has developed irrational fears and anxiety about being harmed by others, causing him to take detours to avoid perceived threats. He also has paranoid thoughts about his professors trying to fail him. The key features here are:- Onset of symptoms 2 months ago, after a traumatic event- Irrational anxiety and fears of being harmed by others - Taking detours to avoid perceived threats- Paranoid thoughts about others trying to harm himThis presentation is most consistent with delusional disorder, paranoid type. The paranoid thoughts are circumscribed and not bizarre. The lack of disorganized speech and behavior makes schizophrenia unlikely. There is no evidence of hallucinations or cognitive deficits to suggest a psychotic disorder. While anxiety is present, the irrational fears and paranoid thoughts point more specifically to a delusional disorder rather than just generalized anxiety. There is no evidence for a personality disorder.C: Delusional disorder 