This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Embryology 2, Subject name: Anatomy
Average reproductive life span of ovum is 
Select and explain. 
A. 6-12 hrs, B. 12-24 hrs, C. 24-26 hrs, D. 48 hrs
B: 12-24 hrs
Answer: B: 12-24 hrs 
Explanation: LH surge occurs ~ 36 hours before ovulation LH peak occur ~ 12 hours before ovulation & marks the release of Ist polar body. This mature oocyte (ovum) remain ble for feilization for ~ 24 hours.