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
The best time of the menstrual cycel for endometrial biopsy in infeility investigation is : 
Select and explain. 
A. First day of menstruation, B. One week after the onset of menstruation, C. Just near due date of the next menstruation, D. On the 15th day of the onset on menstruation
C: Just near due date of the next menstruation
Answer: C: Just near due date of the next menstruation 
Explanation: Just near due date of the next menstruation