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': 'Feilised ovum reaches the uterine cavity by: \nSelect and explain. \nA. 4-5 days after feilisation, B. 6-7 days after feilisation, C. 7-9 days after feilisation, D. 2-3 days after feilisation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Zygote enters the uterine cavity in the form of Morula on 4 that day after feilisation. Ref:Datta Obs 9 e pg 24;JB Sharma Obs of 19.', 'role': 'assistant'}]