<prompt> Which of the following mechanism CANNOT prevent gastroesophageal reflux?Looping fibres of right crus of diaphragmMucosal folds at gastroesophageal junctionCircular muscle fibres of GE sphincterAngle made by the esophagus with stomach  <response>: 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 18e, Page 1108; Essential of Surgery By Sunil Chumber 1e, Page 750; Textbook of Surgery By S. Das 3e, Page 790; Bailey Love 22e, Page 650. 