<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 42-year-old man comes to the physician because of a 3-year history of urinating up to 20 times each day. He has not had any dysuria and nocturia. He has been evaluated by several urologists but has not received a specific diagnosis despite extensive diagnostic testing. Various pharmacologic treatments have not improved his symptoms. He quit his job 1 year ago and stopped attending social events because his frequent urination has been disruptive. He spends most of his time at the library trying to learn what could be causing his symptoms. He would like to undergo a CT scan of his entire body to evaluate for cancer. Physical examination and laboratory studies show no abnormalities. Mental status examination shows a depressed mood and constricted affect. There is no evidence of suicidal ideation. Which of the following is the most likely explanation for this patients symptoms?? A: Malingering, B: Atypical depression, C: Somatic symptom disorder, D: Adjustment disorder, E: Recurrent urinary tract infections,  <response>: This is a clinical vignette describing a 42-year-old man with a 3-year history of urinary frequency up to 20 times per day, without dysuria or nocturia. He has undergone extensive diagnostic workup without a definitive diagnosis, and various medications have not helped his symptoms. His urinary symptoms have caused him to quit his job and avoid social events. He spends most of his time at the library researching potential causes, and wants to undergo full body CT scan to check for cancer, despite normal physical exam and lab tests. Mental status exam shows depressed mood and constricted affect, without suicidal ideation. The key findings here are the longstanding urinary symptoms without any objective medical explanation despite extensive workup, along with the patients functional impairment and preoccupation with his undiagnosed condition. This suggests a psychiatric rather than organic etiology, especially given the mood symptoms. The request for full body cancer screening despite normal initial evaluation points more towards health anxiety rather than malingering. Therefore, somatic symptom disorder is the most likely diagnosis.C: Somatic symptom disorder 