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
Monochorionic 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