This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'A 12kg child has diarrhoea, fluid to be replaced in 1st 4 hours \nSelect and explain. \nA. 1200-1600 ml, B. 800-1200 ml, C. 400-800 ml, D. 0-400 ml', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The fluid to be replaced in first 4 hours is 800-1200 ml. Ref : Park 23rd edition Pgno : 225', 'role': 'assistant'}]