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: Medicine
CCF is associated with Increase in all of the following except - 
Select and explain. 
A. Right atrial mean pressure, B. Serum sodium, C. Serum urea, D. Serum norepinephrine
B: Serum sodium
Answer: B: Serum sodium 
Explanation: None