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
MC cause of secondary amenorrhoea is: March 2004 
Select and explain. 
A. Pregnancy, B. TB, C. Thyrotoxicosis, D. None of the above
A: Pregnancy
Answer: A: Pregnancy 
Explanation: Ans. A i.e. Pregnancy