This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetic Approach to Pediatric Medicine, Subject name: Pediatrics
[{'content': "Klinefelter's syndrome is diagnosed by: \nSelect and explain. \nA. Karyotyping, B. Ultrasound abdomen, C. Triple test, D. Echocardiography", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. KaryotypingBlood or urine samples can reveal abnormal hormone levels that are a sign OF Klinefelter syndrome. Chromosome analysis. Also called karyotype analysis, this test is used to confirm a diagnosis of Klinefelter syndrome.', 'role': 'assistant'}]