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': 'Ovulation corresponds with: \nSelect and explain. \nA. FSH surge, B. LH surge, C. Progesterone surge, D. Estradiol surge', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. LH surgeA surge in LH secretion triggers ovulationQ, and ovulation normally occurs about 9 hours after the peak of LH surge at midcycle.', 'role': 'assistant'}]