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 duodenum secretes a hormone which has following effects except: \nSelect and explain. \nA. Cause copious pancreatic juice rich in bicarbonate and poor in enzymes, B. Increase gastric motility, C. Causes gall bladder to contract and sphincter of Oddi to relax, D. Leads to meagre flow of pancreatic juice rich in enzymes', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Secretin\xa0was\xa0the\xa0first\xa0gastrointestinal\xa0hormone\xa0discovered and is secreted by the “S” cells in the mucosa of\xa0the duodenum in response to acidic gastric juice emptying into the duodenum from the pylorus of the stomach. Secretin has a mild effect on motility of the gastrointestinal\xa0tract\xa0and acts\xa0to\xa0promote\xa0pancreatic\xa0secretion\xa0of\xa0 bicarbonate, which in turn helps to neutralize the acid in the small intestine.', 'role': 'assistant'}]