This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Anatomy
All of the following are included in first stage of labor except 
Select and explain. 
A. Effacement of cervix, B. Dilatation of cervix, C. Crowning of fetal head, D. Descent of head
C: Crowning of fetal head
Answer: C: Crowning of fetal head 
Explanation: Crowning is a cardinal movement of labor which occurs during second stage