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
Risk factors for Endometriosis are all except 
Select and explain. 
A. Nulliparity, B. Smoking, C. Early menarche, D. Alcohol consumption
B: Smoking
Answer: B: Smoking 
Explanation: Smoking is protective factor for Endometriosis.