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 IC ion concentration is seen in which GI secretion ? \nSelect and explain. \nA. Saliva, B. Colonic, C. Gastric, D. Jejunal', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Colonic", 'role': 'assistant'}]