This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'Cholecystokinin is produced from: \nSelect and explain. \nA. Hepatocyte, B. Gastric mucosa, C. Duodenal mucosa, D. Epithelial cells of distal common bile duct', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The major factor controlling the contraction of the gallbladder is the hormone cholecystokinin (CCK), which is released from the duodenal mucosa (I cells) in response to the ingestion of fats and amino acids. REF: GUYTON 12TH ED.', 'role': 'assistant'}]