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 main site of bicarbonate reabsorption is: \nSelect and explain. \nA. Proximal convoluted tubule., B. Distal convoluted tubule., C. Coical collecting duct., D. Medullary collecting duct.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Proximal convoluted tubuleAbout 80 to 90 percent of bicarbonate reabsorption occurs in the proximal tubuleQ.Segment% HCO3 reabsorbed% Na+ reabsorbedProximal tubule80-90%Q60%QLoop of Henle (thick)10%30%Distal tubule & collecting duct.Remainder10%', 'role': 'assistant'}]