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: Physiology
[{'content': 'A feilized 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: 3-4 days REF: William's obstetrics 22nd ed, Langman's Medical Embryology 9' edition page 45 LH Surge 24 hours before ovulation Ovulation 0 hours Feilization 24 hours after ovulation (Day 1) Reaches uterine cavity 3-4 days post feilization (Day 4-5 post ovulation) Implantation 7-9 day post feilization", 'role': 'assistant'}]