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
embryo implants on the endometrium after--------of feilisation : 
Select and explain. 
A. 3-5 days, B. 7-9 days, C. 10 days, D. 16 days
B: 7-9 days
Answer: B: 7-9 days 
Explanation: 6-7 days after feilisation, the embryo implants the uterine wall. Reference : william's Textbook of Obstetrics 4th edition page no 89