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
The hyperosmolarity of the renal meduila is due to increased content of - 
Select and explain. 
A. K+, B. Na +, C. Glucose, D. Na ++
B: Na +
Answer: B: Na + 
Explanation: B i.e. Na +