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
Klinefelter syndrome is? 
Select and explain. 
A. 47XXXY, B. 47XXY, C. 47 XX, D. 47 XY
B: 47XXY
Answer: B: 47XXY 
Explanation: Ans. (b) 47XXYRef: Robbiris pathology 9th ed. 1165