单项选择题
Which of the following is not true regarding the physiologicaleffects of gastric acid ()
A．It can activate pepsinogen and supply the acidic environment required
by pepsin
B．It denatures proteins in food and makes them easy to break down
C．Kills bacteria that enter the stomach with food
D．Promotes the absorption of vitamin B12
E．After entering small intestine, hydrochloric acid can promote the
secretion of bile, pancreatic juice and small intestine fluid
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