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
Ovulation coincides with : 
Select and explain. 
A. Estrogen surge, B. Progesterone surge, C. FSH surge, D. LH surge
D: LH surge
Answer: D: LH surge 
Explanation: LH surge