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: Physiology
Which pa of the nephron is impermeable to water? 
Select and explain. 
A. A, B. B, C. C, D. D
C: C
Answer: C: C 
Explanation: The thick ascending limb of loop of henle is completely impermeable to water, hence it is also called as the diluting segment of the nephron Ref: Guyton review 3rd edition/page 83