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
Second stage of labor stas from: March 2013 
Select and explain. 
A. Rupture of membranes, B. 3/5 dilatation of cervix, C. Full dilatation of cervix, D. Crowning of head
C: Full dilatation of cervix
Answer: C: Full dilatation of cervix 
Explanation: Ans. C i.e. Full dilatation of cervix Stages of labor 1st stage: Onset of labor to dilatation of cervix - 6-20 hours in primigravida - 2-10 hours in multigravida 2nd stage: From full dilatation of cervix to complete bih of baby 3rd stage: Bih of infant to delivery of placenta