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 predictor of ovulation is : 
Select and explain. 
A. Estrogen peak, B. Follicle stimulating hormone (FSH) surge, C. Onset of the LH surge, D. Preovulatory rise in progesterone
C: Onset of the LH surge
Answer: C: Onset of the LH surge 
Explanation: Onset of the LH surge