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: Gynaecology & Obstetrics
[{'content': 'Feilised ovum is embedded in the endometrium at about which day after feilization : \nSelect and explain. \nA. Second day, B. Fouh day, C. Sixth day, D. Eight day', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Eight day', 'role': 'assistant'}]