This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sex Hormones, Subject name: Physiology
In 29 days menstrual cycle ovulation takes place at? 
Select and explain. 
A. 14th day, B. 15th day, C. 16th day, D. 17th day
B: 15th day
Answer: B: 15th day 
Explanation: ANSWER: (B) 15th dayREF: Ganong's 22nd ed p.434In a menstrual cycle the post ovulatory days remains constant, hence to calculate the day of ovulation substract 14 from the total days of cycle; i.e. in a 29 days cycle ovulation takes place on 15th day (29-14),