This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'All are true regarding LH surge except \nSelect and explain. \nA. LH surge acts rapidly on both granulosa and theca cells of preovulatory follicle, B. LH surge initiates re - entry of oocyte into meiosis, C. Ovulation occurs 24 hours after LH surge, D. Mean duration of LH surge is 48 hours', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ovulation occurs 36 to 40 hours after the onset of LH surge.', 'role': 'assistant'}]