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
What is the number of Barr bodies seen in cells of person with Klinefelter syndrome? 
Select and explain. 
A. 0, B. 1, C. 2, D. 3
B: 1
Answer: B: 1 
Explanation: Number of Barr bodies = (N - 1)
N is the number of x chromosomes.
Klinefelter syndrome - 47 XXY
Barr bodies = (2 - 1) = 1