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
Bag of membranes ruptures: 
Select and explain. 
A. Before full dilatation of cervix, B. After full dilatation of Cx, C. After head is engaged, D. With excessive show
A: Before full dilatation of cervix
Answer: A: Before full dilatation of cervix 
Explanation: Before full dilatation of cervix