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: Pathology
Karyotype in Klinefelter’s syndrome is? 
Select and explain. 
A. 45 XXX, B. 45XO, C. 46XXY, D. 47 XXY
D: 47 XXY
Answer: D: 47 XXY 
Explanation: None