This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cytogenetic Disorders, Subject name: Pathology
[{'content': 'Klinefelter syndrome is? \nSelect and explain. \nA. 47XXXY, B. 47XXY, C. 47 XX, D. 47 XY', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) 47XXYRef: Robbiris pathology 9th ed. 1165', 'role': 'assistant'}]