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
HCl secretion is stimulated bya)  Secretinb) Somatostatinc) Histamined) Gastrine) VIP 
Select and explain. 
A. ab, B. cd, C. bd, D. ac
B: cd
Answer: B: cd 
Explanation: HCl secretion
-        Stimulated by
o   Acetylcholine- Cephalic and Gastric phase (Vaso vagal reflex)
o   Gastrin- Gastric and Intestinal phase
o   Histamine
-        Inhibited by
o   Acid (low pH)
o   Somatostatin
o   Secretin
o   Cholecystokinin
o   GIP
o   VIP