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
[{'content': 'CCF is associated with Increase in all of the following except - \nSelect and explain. \nA. Right atrial mean pressure, B. Serum sodium, C. Serum urea, D. Serum norepinephrine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]