This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sex Hormones, Subject name: Physiology
[{'content': 'LH peak occurs how many hours before ovulation - \nSelect and explain. \nA. 36-48hrs., B. 12-24hrs, C. 48-72hrs, D. 72-96hrs', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Events Hours Oestraiol rise 83 Onset of LH surge 34-36 Oestraiol peak 24-36 LH peak 12-24 Progesterone rise 8 Approximate time interval of events in menstrual cycle prior to ovulation', 'role': 'assistant'}]