This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Reproductive physiology and hormones in females, Subject name: Gynaecology & Obstetrics
Normal blood loss in menstruation is 
Select and explain. 
A. 20-40ml, B. 40-80ml, C. 80-120ml, D. 120-150ml
A: 20-40ml
Answer: A: 20-40ml 
Explanation: Normal blood loss during menstruation is 30-40ml Ref: Internet sources