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: Social & Preventive Medicine
A 12 kg child with diarrhoea, fluid to be replaced in first 4 hours 
Select and explain. 
A. 0-400 ml, B. 800-1200 ml, C. 400-800 ml, D. 1200-1600 ml
B: 800-1200 ml
Answer: B: 800-1200 ml 
Explanation: None