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: Gynaecology & Obstetrics
The following statement is true about internal rotation of the head? 
Select and explain. 
A. Rotation occurs mostly in the cervix, B. In majority, rotation occurs in the pelvic floor, C. Rotation occurs commonly during crowning of the head, D. Rotation is easier in primiparae than multiparae
B: In majority, rotation occurs in the pelvic floor
Answer: B: In majority, rotation occurs in the pelvic floor 
Explanation: The level at which internal rotation occurs is variable. Rotation in the cervix although orable is a less frequent occurrence. In a majority of cases, rotation occurs in the pelvic floor. Rarely it occurs as late as during crowning of the head.D.C.DUTTA&;S TEXTBOOK OF GYNECOLOGY, Pg no:125,7th edition