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': 'Maximum absorption of the water occurs at \nSelect and explain. \nA. Proximal convoluted tubule, B. Distal convoluted tubule, C. Collecting duct, D. Loopofhenle', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Proximal convoluted tubule) (802 - Ganong 22th) (294- K.S 4th) (652- Ganong 23rd)* In the presence / abscence of vasopressin, the greatest fraction of filtered water is absorbed in the proximal convoluted tubules* SITE OF REABSORPTIONS1. Substance Reabsorbed from PCT-Glucose, Aminoacid, Na+ ,K+ ,Ca++ ,HCO3 ,Cl- ,PO4, uric acid and water2. Substance Reabsorbed from DCT - Naf ,HCO3 and water3. Substance Reabsorbed from Loop of Henle - Na+ and Cl~**- 80-90% of bicarbonate reabsorption occurs in PCT1. Absorption of water in PCT (obligatory reabsption) i.e. independent of ADH2. Absorption of water in DCT & collecting duct (facultative - reabsorption) i.e. dependent on ADH levels', 'role': 'assistant'}]