You are answering a USMLE-style medical question. Question: A 36-year-old woman comes to the physician because of difficulty discarding items in her home. She says that the accumulation of things in her kitchen and dining room makes regular use of these spaces incredibly difficult. Her behavior started when she was in high school. She feels anxious when she tries to discard her possessions and her husband tries to clean and organize the home. This behavior frustrates her because most of the items she saves have little emotional or monetary value. She reports that there has been no improvement despite attending cognitive behavioral therapy sessions for the past 6 months. She now feels that her behavior is “taking over” her life. She does not drink, smoke, or use illicit drugs. She takes no medications. Her temperature is 36°C (96.8°F), pulse is 90/min, respirations are 12/min, and blood pressure is 116/80 mm Hg. On mental status examination, she is calm, alert, and oriented to person, place, and time. Her mood is depressed; her speech is organized, logical, and coherent; and there are no psychotic symptoms. Which of the following is the most appropriate next step in management? Options: A) Fluoxetine B) Lamotrigine C) Buspirone D) Methylphenidate Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.