This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
The main driving force for water reabsorp on by the proximal tubule epithelium is 
Select and explain. 
A. Active reabsorp on of amino acids and glucose, B. Active reabsorp on of Na+, C. Active reabsorp on of water, D. Pinocytosis
B: Active reabsorp on of Na+
Answer: B: Active reabsorp on of Na+ 
Explanation: .