This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Introduction and gametogenesis., Subject name: Anatomy
First polar body is extruded at 
Select and explain. 
A. Menstruation, B. Ovulation, C. Feilization, D. Menopause
B: Ovulation
Answer: B: Ovulation 
Explanation: Oogenesis is formation of ovum i.e. female gamete. First polar body is released after LH surge (i.e. at or before ovulation) LH surge occurs 36 hrs before ovulation. LH peak occurs 12 hrs before ovulation. (first polar body released )