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': 'Ovulation coincides with : \nSelect and explain. \nA. Estrogen surge, B. Progesterone surge, C. FSH surge, D. LH surge', 'role': 'user'}, {'content': 'Answer: D \nExplanation: LH surge', 'role': 'assistant'}]