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': 'Best stimuli for CCK secretion is : \nSelect and explain. \nA. Acid, B. Protein, C. Bile, D. Fat', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Protein', 'role': 'assistant'}]