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': 'Morula enters into uterine cavity after how many days of filization ? \nSelect and explain. \nA. 5-Apr, B. 7-Jun, C. 10-Aug, D. 12-Oct', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., 4-5", 'role': 'assistant'}]