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 diagnosed by – \nSelect and explain. \nA. Karyotyping, B. USG abdomen, C. Triple test, D. Echocardiography', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]