This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
What is the osmolarity of urine the influence of ADH? 
Select and explain. 
A. 50 mOsmol / L, B. 800 mOsmol / L, C. 1200 mOsmol / L, D. 500 mOsmol / L
C: 1200 mOsmol / L
Answer: C: 1200 mOsmol / L 
Explanation: ADH will increase water reabsorption into medulla,making low volume,concentrated urine of 1200 - 14000 mOsmol / L
Urine osmolarity in absence of ADH is 30 - 50 mOsmol / L