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': 'Kleiner syndrome is diagnosed by \nSelect and explain. \nA. Karvo typing, B. USG abdomen, C. Triple test, D. Echocadiography', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Klinefelter syndrome\n\nExtra x chromosome (47 XXY) karyotype\nSmall testes with hyalinised seminiferous tubules\nDelayed puberty\nDelayed secondary sexual characters Small penis\nTall & underweight\nMental retardation\nGynaecomastia', 'role': 'assistant'}]