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
[{'content': 'Ovulation occurs : \nSelect and explain. \nA. Before LH surge, B. After biphasic rise in body temperature, C. After ripening of follicle by FSH, D. Before estrogen peak', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ovulation After estradiol reaches a peak of 200pg/ml and is sustained for about 48 hours, it exes a possitive feedback action for LH surge Final maturation of follicle is obtained by combined effect of FSH and LH Ovulation occurs 24-48 hours after LH surge Ref: D.C. Dutta's Textbook of Gynaecology, 6th edition, page no: 93", 'role': 'assistant'}]