This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infertility, Subject name: Gynaecology & Obstetrics
[{'content': 'Hysterosalpingography (HSG) is performed between which of the following menstrual cycle days? \nSelect and explain. \nA. 2 to 6, B. 7 to 12, C. 14 to 18, D. 21 to 26', 'role': 'user'}, {'content': "Answer: B \nExplanation: Hysterosalpingography (HSG) is performed after menses but prior to ovulation between cycle days 7 and 12 to avoid potential pregnancy and take advantage of the thinner proliferative phase endometrium. Reference: Novak's Gynecology; 14th edition; Chapter 32; Infeility and Assisted Reproductive Technology", 'role': 'assistant'}]