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
Salivary amylase is inactivated by 
Select and explain. 
A. Enteropeptidase, B. Low pH of stomach, C. High pH of intestine, D. None
B: Low pH of stomach
Answer: B: Low pH of stomach 
Explanation: Salivary amylase is secreted by the salivary glands.The oral pH is about 7.0 and it is the optimum pH for the action of salivary amylase.The pH of stomach is about 1.2 and this inhibit the action of salivary amylase.(Ref: Ganong&;s Review of medical physiology)