This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidneys and Body Fluids, Subject name: Physiology
[{'content': 'The main site of bicarbonate reabsorption is \nSelect and explain. \nA. Proximal convoluted tubule, B. Distal convoluted tubule, C. Cortical collecting duct, D. Medullary collecting duct', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Proximal convoluted tubule(Ref: Ganong, 25th ed/p.679)Proximal convoluted tubule (PCT) reabsorbs,2/3rd (67%) of filtered sodium chloride (NaCl)2/3rd (67%) of filtered water2/3rd (67%) of filtered potassium (K+)2/3rd (67%) of filtered urea70 % of filtered calcium80 % of Filtered phosphate and bicarbonate100% of filtered glucose and amino acids', 'role': 'assistant'}]