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 impoant hormone that increases gallbladder contraction after a fatty meal is: \nSelect and explain. \nA. Gastrin, B. Secretin, C. CCK, D. GIP', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. c. CCK', 'role': 'assistant'}]