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': 'Where in the kidney does acitve reabsorption of sodium ions occur - \nSelect and explain. \nA. Collecting duct, B. Distal tubule, C. Ascending limb of Henle, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. All', 'role': 'assistant'}]