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
Which part of the nephron is impermeable to water 
Select and explain. 
A. A, B. B, C. C, D. D
C: C
Answer: C: C 
Explanation: Ans. (c) C(Ref: Guyton and Hall Physiology Review, 3rd ed/p.83)Point C is the thick ascending loop of HenleIt is impermeable to water