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': 'Not seen in hyponatremia: March 2009 \nSelect and explain. \nA. Nausea, B. Delusion, C. Vomiting, D. Anorexia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: Delusion', 'role': 'assistant'}]