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 osmotic gradient is found in ________ \nSelect and explain. \nA. Outer cortex, B. Inner medulla, C. Inner cortex, D. Outer medulla', 'role': 'user'}, {'content': 'Answer: B \nExplanation: There is osmotic gradient from cortex to tip of medulla', 'role': 'assistant'}]