This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'In Klinefelter syndrome, all are true except \nSelect and explain. \nA. Negative feedback on FSH and LH are lost, B. Decreased Androstenedione levels, C. Hypoplastic male external genitalia, D. Most common cause of primary testicular failure', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In Klinefelter syndrome, since testosterone levels are decreased, negative feedback on FSH and LH is lost.\nIncreased FSH stimulates Leydig cells, thereby causing elevated levels of Androstenedione.', 'role': 'assistant'}]