This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sex Hormones, Subject name: Physiology
[{'content': 'A fertilized ovum reaches uterine cavity in? \nSelect and explain. \nA. 3-4 days, B. 5-6 days, C. 7-8 days, D. 10 days', 'role': 'user'}, {'content': "Answer: A \nExplanation: ANSWER: (A) 3-4 daysREF: William's obstetrics 22nd ed, Langman s Medical Embryology 9th edition page 45LH Surge24 hours before ovulationOvulation0 hoursFertilization24 hours after ovulation (Day 1)Reaches uterine cavity3-4 days post fertilization (Day 4-5 post ovulation)Implantation7-9 day post fertilization", 'role': 'assistant'}]