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
Commonest manifestation of endometriosis is : 
Select and explain. 
A. Infeility, B. Pain, C. Bleeding, D. Leukorrhoea
B: Pain
Answer: B: Pain 
Explanation: Pain