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: Surgery
Which of the following mechanism CANNOT prevent gastroesophageal reflux? 
Select and explain. 
A. Looping fibres of right crus of diaphragm, B. Mucosal folds at gastroesophageal junction, C. Circular muscle fibres of GE sphincter, D. Angle made by the esophagus with stomach
C: Circular muscle fibres of GE sphincter
Answer: C: Circular muscle fibres of GE sphincter 
Explanation: All the factors except circular fibres of GE sphincters have been mentioned in the mechanisms which help in the prevention of gastroesophageal disease. So Circular muscle fibres of GE sphincter is answer of choice here. Ref: Sabiston 18/e, Page 1108; Essential of Surgery By Sunil Chumber 1/e, Page 750; Textbook of Surgery By S. Das 3/e, Page 790; Bailey & Love 22/e, Page 650.