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: Physiology
A feilised ovum reaches the uterine cavity by the 7th day from ovulation. How long does it take for it to travel through the fallopian tube? 
Select and explain. 
A. 3-4 days, B. 5-6 days, C. 7-8 days, D. 10 days
A: 3-4 days
Answer: A: 3-4 days 
Explanation: The feilised ovum takes 3-4 days to travel through the fallopian tube and reaches the uterine cavity by the 7th day from ovulation. It is fully embedded in the endometrium by the 14th day.