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: Gynaecology & Obstetrics
[{'content': 'After how many days of ovulation, embryo implantation occurs in the uterine cavity : \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 can be defined as the process by which the blastocyst penetrate the epithelium and then the circulatory system of the mother It occurs 7-9 days after feilization Reference: Textbook of Obstetrics; Sheila balakrishnan; 2nd edition; Page no: 57', 'role': 'assistant'}]