This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infeility (Eggs'plantation!), Subject name: Gynaecology & Obstetrics
[{'content': "An infeile man, 28 years of age with semen analysis suggestive of azoospermia on two occassions,one month apa. FSH normal Testosterone normal. Most probable cause is? \nSelect and explain. \nA. Undescended testis, B. Klinefelter's syndrome, C. Kallmann syndrome, D. VAS obstruction", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Kallman syndrome- Hypothalamic failure, Low FSH Klinefelters will have Testicular atrophy high FSH Undescended testes also will have high FSH Normal FSH and testosterone will be seen in obstructive azoospermia such as obstruction of vas deferens', 'role': 'assistant'}]