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': 'A couple complains of primary infertility in spite of staying together for 4 years and having unprotected intercourse, all tests in a wife are normal. Semen analysis shows a volume of 0.8 ml/ sperm count is 0, fructose is absent what is done next? \nSelect and explain. \nA. Testicular FNAC, B. Ultrasound for obstruction, C. Local palpation of vas, D. Karyotyping', 'role': 'user'}, {'content': 'Answer: B \nExplanation: This is probably a case of obstructive azoospermia.\nIn this condition we need to know the site and nature of blockage. \nAmong the given options ultrasound is the best. \nVasogram can also be done.', 'role': 'assistant'}]