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 a 25 day cycle ovulation occurs on : 
Select and explain. 
A. 14th day, B. 13'h day, C. 11'h day, D. 12'h day
C: 11'h day
Answer: C: 11'h day 
Explanation: 11th day