This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Anatomy
[{'content': 'After how many days of ovulation embryo implantation occurs \nSelect and explain. \nA. 3-5 days, B. 7-9 days, C. 10-12 days, D. 13-15 days', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Implantation is the process by which the blastocyst penetrates the uterine mucosa to get implanted in the endometrium.It stas on 6- 7 day after ovulation. Ref:JB Sharma Obs pg 20.', 'role': 'assistant'}]