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
Gastric emptying sequence into duodenum 
Select and explain. 
A. Fat > protein > carbohydrate, B. Fat < carbohydrate < protein, C. Protein < fat < carbohydrate, D. Protein > fat > carbohydrate
A: Fat > protein > carbohydrate
Answer: A: Fat > protein > carbohydrate 
Explanation: Food rich in carbohydrate leaves the stomach in a few hours. Protein-rich foods leave more slowly and emptying is slowest after a meal containing fat. Hyperosmotic contents in duodenum decrease gastric emptying. CCK is also an inhibitor of gastric emptying (Ref: Ganong&;s Review of medical physiology, 23 rd edition, page 473)