This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal System, Subject name: Physiology
Factor increasing gastric motility: 
Select and explain. 
A. Presence of fatty food in stomach, B. Distension of stomach, C. Presence of tryptophan in stomach, D. Presence of acid in stomach
B: Distension of stomach
Answer: B: Distension of stomach 
Explanation: Promoters of gastric emptying Chemical | Gastrin Mechanical | Gastric Distension Inhibitors of gastric emptying: Enterogastric inhibition: Duodenal distension Irritation of duodenal mucosa Acidic chyme Hyperosmolar chyme High fat content of chyme Hormonal inhibition: 6. CCK