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
Monochorlonic monoamniotic twin occurs if; division occurs : 
Select and explain. 
A. Before 24 hours, B. 1-4 days, C. 4-8 days, D. 8 days
D: 8 days
Answer: D: 8 days 
Explanation: 8 days