This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Maternal Anatomy and Physiology, Subject name: Gynaecology & Obstetrics
[{'content': 'After how many days of ovulation, embryo implantation occurs? \nSelect and explain. \nA. 3-5 days, B. 6-9 days, C. 10-12 days, D. 13-15 days', 'role': 'user'}, {'content': 'Answer: B \nExplanation: After the feilization process, embryo is formed in the ampulla and it reaches the uterine cavity on 3rd - 4th day and the implantation occur between 6th to 9th day of ovulation', 'role': 'assistant'}]