This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics, Subject name: Medicine
Barr body is seen in: 
Select and explain. 
A. Turners syndrome, B. Klinefelters syndrome, C. Testicular feminisation, D. 46 XY
B: Klinefelters syndrome
Answer: B: Klinefelters syndrome 
Explanation: Ans: b