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: Anatomy
Degree of normal intestinal loop rotation is: 
Select and explain. 
A. 180deg counterclockwise, B. 180deg clockwise, C. 270deg counterclockwise, D. 270deg clockwise
C: 270deg counterclockwise
Answer: C: 270deg counterclockwise 
Explanation: Abnormal rotation of the intestinal loop may result in twisting of the intestine (volvulus) and a compromise of the blood supply. Normally, the primary intestinal loop rotates 270deg counterclockwise. Ref: Langman's embryology 11th edition Chapter 14.