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
Which of the following is not a cause for primary amenorrhea? 
Select and explain. 
A. Sheehan's syndrome, B. Kallmann's syndrome, C. Mayer Rokitansky Koster Hauser syndrome, D. Turner syndrome
A: Sheehan's syndrome
Answer: A: Sheehan's syndrome 
Explanation: None