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
In 40 days of the menstrual cycle, the ovulation occurs at : 
Select and explain. 
A. 14th day, B. 20th day, C. 26th day, D. 30th day
C: 26th day
Answer: C: 26th day 
Explanation: None