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
Not seen in hyponatremia: March 2009 
Select and explain. 
A. Nausea, B. Delusion, C. Vomiting, D. Anorexia
B: Delusion
Answer: B: Delusion 
Explanation: Ans. B: Delusion