This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Reason for hyperosmolarity is \nSelect and explain. \nA. Increased glomerular capillary pressure, B. Decreased absorbtion of Na+ in PCT, C. Increased activity of Na+ K+ 2cl- ATPase in loop, D. Decreased activity of Na+ K+ ATPase in loop', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Hyperosmolarity in the interstitium of kidney is due to activity of na+k+2cl- pump at the ascending limb of loop of henle Ref:Guyton and Hall textbook of medical physiology 12th edition,page:480,481,482', 'role': 'assistant'}]