Which of the following reflexes is controlled by the vagus nerve?

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Secretion of bile from the liverRelease of bicarbonate by the pancreasGastric secretion during the cephalic phaseProduction of mucus by Brunner’s glands

Explanation

Among these options, the cephalic phase of gastric secretion is a reflex primarily mediated by the vagus nerve, which stimulates gastric secretions in response to the sight, smell, or thought of food. The other processes are not directly controlled by vagal reflexes.