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: Gynaecology & Obstetrics
Barr body is present in all except 
Select and explain. 
A. Klinefelter syndrome, B. Turner syndrome, C. Mullerian agenesis, D. Congenital adrenal hyperplasia
B: Turner syndrome
Answer: B: Turner syndrome 
Explanation: Karyotype of Turner syndrome = 45X0.
No barr body, as there is no extra X chromosome.