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': 'Diagnosis of imminent ovulation is : \nSelect and explain. \nA. Endometrial biopsy, B. Pain, C. Temperature cha, D. LH surge', 'role': 'user'}, {'content': 'Answer: D \nExplanation: LH surge', 'role': 'assistant'}]