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': 'Calculate water deficit for 50 kg male with Na=160 meg \nSelect and explain. \nA. 2.9 L hypeonic saline, B. 2.9 L half normal saline, C. 1.5 L 5% dextrose in water, D. 1.5 L 10% dextrose in water', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 2.9L half normal saline", 'role': 'assistant'}]