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
[{'content': 'Amount of ORS to be given in the first 4 hours to a child with some dehydration is - \nSelect and explain. \nA. 50 ml/kg body wt, B. 75 ml/kg body wt, C. 100 ml/kg body wt, D. 200 ml/kg body wt', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]