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
True about timing of LH surge 
Select and explain. 
A. Occur 12 hour before ovulation, B. Occur 12 hour after ovulation, C. Occur 24 hour before ovulation, D. Occur 24 hour after ovulation
C: Occur 24 hour before ovulation
Answer: C: Occur 24 hour before ovulation 
Explanation: LH surge initiates luteinization acting through its receptors about 24-48 hours prior to ovulation