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
The prerequisites for internal rotation of the head are all except: 
Select and explain. 
A. Well-flexed head, B. Efficient uterine contraction, C. Favourable shape of the pelvis, D. Tone of the abdominal muscles
D: Tone of the abdominal muscles
Answer: D: Tone of the abdominal muscles 
Explanation: None