This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Reproductive physiology and hormones in females, Subject name: Gynaecology & Obstetrics
True about timing of LH surge : 
Select and explain. 
A. Occur 12 hour before ovulation, B. Occur 24 hour before ovulation, C. Occur 12 hour after ovulation, D. Occur 24 hour after ovulation
B: Occur 24 hour before ovulation
Answer: B: Occur 24 hour before ovulation 
Explanation: LH surge initiates luteinization acting through its receptors about 24-48 hours prior to ovulation. Ref: D.C. Dutta's Textbook of Gynaecology, 6th edition, page no: 92