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: Surgery
[{'content': 'A couple presents with infeility. On investigation, the husband is found to have azoospermia on semen analysis. Vas was not palpable on per rectal examination. Semen had low volume, high viscosity and fructose was present. What will you do next? \nSelect and explain. \nA. Karyotype, B. PSA, C. Trans-rectal ultrasound, D. CFTR gene mutation analysis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. d. CFTR gene mutation analysis', 'role': 'assistant'}]