This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infeility (Eggs'plantation!), Subject name: Gynaecology & Obstetrics
[{'content': 'Hysterosalpingogram is performed on which day of a normal 28-day menstrual cycle for a woman having menstrual periods for 5 days? \nSelect and explain. \nA. Day 4, B. Day 8, C. Day 14, D. Day 21', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Primary diagnostic steps in the workup of the infeile couple include Documentation of ovulation by USG or mid-luteal phase serum progesterone Semen analysis Hysterosalpingogram. HSG is performed in the mid-follicular phase (day 8 or 9), in order to evaluate the fallopian tubes and the contour of the uterine cavity. It should not be done while the patient is menstruating or after ovulation has occurred and in the premenstrual phase as the patient might be pregnant.', 'role': 'assistant'}]