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 for infeility is taken on .....day : \nSelect and explain. \nA. 5 to 7, B. 12 to 4, C. 23 to 26, D. 9 to 11', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 23 to 26', 'role': 'assistant'}]