This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
After how many hours of LH surge does ovulation occurs? 
Select and explain. 
A. 24-Dec, B. 24-48, C. 24-36, D. 36-48
C: 24-36
Answer: C: 24-36 
Explanation: The most appropriate option has been taken as the answer. An acute rise of LH triggers ovulation and development of corpus luteum LH surge occurs 34-36 hours before ovulation, ion responsible to prevent poly spermy at the time of feilization is calcium. Ref: Gray's 39e/p-210-220