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': 'Endometrial biopsy is done in which phase of menstrual cycle : \nSelect and explain. \nA. 5 - 7 days, B. 12 - 14 days, C. 18 - 20 days, D. 22 - 24 days', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 22 - 24 days', 'role': 'assistant'}]