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': 'Maximum contraction of gall bladder is seen with \nSelect and explain. \nA. CCK, B. Secretin, C. Gastrin, D. Enterogastrone', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bile salts are the most important cholerectic or the substance that increases bile secretion. Cholecystokinin (CCK) is the most important cholagogue or substance that increases the contraction.', 'role': 'assistant'}]