<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 21-year-old man is brought to the office by his parents due to concerns about his behavior. They describe their son as aloof and a loner who earns average to below average grades in school. Today, his heart rate is 90min, respiratory rate is 17min, blood pressure is 11065 mm Hg, and temperature is 36.8C 98.2F. On physical examination, he appears gaunt and anxious. His heart has a regular rhythm, and his lungs are clear to auscultation bilaterally. CMP, CBC, and TSH are normal. A urine toxicology test is negative. During the examination, he avoids eye contact and appears detached. When asked about his social life, he claims that he does not care about making friends and prefers to be alone. He says he enjoys going to the movies, but he enjoys doing this alone. He has not had a romantic partner before and takes little pleasure in intimacy. He denies experiencing hallucinations or delusions. Which of the following is the most likely diagnosis?? A: Avoidant personality disorder, B: Schizoid personality disorder, C: Schizotypal personality disorder, D: Major depressive disorder, E: Autism spectrum disorder,  <response>: Based on the description in the question stem, the patient is a 21-year-old man who appears aloof, detached, and avoids social interactions. He prefers being alone, has no interest in making friends or romantic relationships, and takes little pleasure in intimacy. He denies hallucinations or delusions. This presentation is most consistent with schizoid personality disorder, which is characterized by detachment from social relationships and restricted emotional expression. The lack of interest in social interactions and intimacy along with emotional detachment point to schizoid personality disorder rather than the other options.B: Schizoid personality disorder 