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': 'Most potent stimulus for bile secretion is \nSelect and explain. \nA. Cholecystokinin, B. Gastrin, C. Secretin, D. Bile acid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Bile is secreted in two stages by the liver: (1) The initial portion is secreted by the principal functional cells of the liver, the hepatocytes; this initial secretion contains large amounts of bile acids, cholesterol, and other organic con-stituents.\xa0 It\xa0is\xa0secreted\xa0into\xa0minute\xa0bile\xa0 canaliculi\xa0that originate between the hepatic cells. (2)\xa0 Next,\xa0 the\xa0 bile\xa0 flows\xa0in\xa0the\xa0canaliculi\xa0toward\xa0the interlobular\xa0 septa,\xa0 where\xa0 the\xa0 canaliculi\xa0 empty\xa0into\xa0terminal bile ducts and then into progressively larger ducts, finally reaching the hepatic duct and common bile duct.', 'role': 'assistant'}]