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
[{'content': 'Salivary amylase is inactivated by \nSelect and explain. \nA. Enteropeptidase, B. Low pH of stomach, C. High pH of intestine, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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)', 'role': 'assistant'}]