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
[{'content': 'The most important action of Secretin is to \nSelect and explain. \nA. neutralize the acid from the stomach, B. increase secretion of bicarbonates by pancreas, C. decrease gastric secretion, D. cause contraction of pyloric sphincter', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Main Action of Secretin:\nSecretin increases the secretion of bicarbonate by the duct cells of the pancreas and biliary tract. It thus causes the secretion of a\xa0watery, alkaline pancreatic juice\xa0(with high content of bicarbonate). Its action on pancreatic duct cells is mediated via cAMP.\nSecretin causes alkaline pancreatic juice to flood into the duodenum, neutralizing the acid from the stomach and thus inhibiting further secretion of the hormone - feedback control.\nOther actions:\n\nInhibits gastric juice secretion.\nInhibits gastric motility.\nCauses contraction of pyloric sphincter.\nAugments the potency of action of cholecystokinin on pancreatic secretion.', 'role': 'assistant'}]