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': 'The Principal site of absorption of Sodium is : \nSelect and explain. \nA. Proximal convoluted tubule, B. Distal convoluted tubule, C. Loop of Henle (thick poion), D. Collecting duct', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Proximal convoluted tubuleNormally about 60% of the filtered Na+ is reabsorbed in the proximal tubuleQ.Sodium ReabsorptionPercentageSite60%Proximal tubuleQ (by N a+ - H+ exchange)30%Thick ascending limb (by Na+ - 2C1+ - K+ cotranspo)7%Distal convoluted tubule (by Na+ - Cl- cotranspo)3%Collecting duct. ( ENaC channels)', 'role': 'assistant'}]