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: Physiology
[{'content': 'LH peak occurs how many hours before ovulation ? \nSelect and explain. \nA. 36-48 hrs., B. 12-24 hrs., C. 48-72 hrs., D. 72-96 hrs.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans.B.)12-24 hours Ovulation occurs 34 to 36 hours after the onset of the LH surge and about 10 to 12 hours after the LH peak.', 'role': 'assistant'}]