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: Physiology
Which of the following does not simulate enterogastric reflex? 
Select and explain. 
A. Products of protein digestion in the duodenum, B. Duodenal distension, C. H+ ions bathing duodenal mucosa, D. Hormones
D: Hormones
Answer: D: Hormones 
Explanation: Regulation of gastric emptying by duodenum is through two mechanisms.
-        Hormonal mechanism- Inhibit gastric emptying and decrease gastric acid secretion.

Secretin
CCK
VIP
GIP
Peptide YY

 -        Enterogastric reflex- Inhibit gastric emptying through the intrinsic enteric neural plexus.

Distension of the duodenum
Duodenal hyperosmolarity
Presence of acid, fats and products of protein digestion in the duodenum.