This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Physiology
Stimulant for gastric emptying is 
Select and explain. 
A. Secretin, B. CCK, C. Gastrin, D. Distension
D: Distension
Answer: D: Distension 
Explanation: Distention of the stomach is the major and the only natural stimulus known to increase gastric emptying. The basic pattern of gastric emptying is propoional to the square root function of a volume of a meal. Ref: Ganong 25th ed/page 353