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: Pediatrics
[{'content': 'Klinefelter syndrome is dignosed by ? \nSelect and explain. \nA. Karyotyping, B. USG abdomen, C. Triple test, D. Echocardiography', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Karyotyping", 'role': 'assistant'}]