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
Most potent stimulus for secretin is - 
Select and explain. 
A. Dilatation of intestine, B. Acid chime, C. Protein, D. Fat
B: Acid chime
Answer: B: Acid chime 
Explanation: B i.e. Acid chyme