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: Anaesthesia
[{'content': 'Dose of ketamine by IM route is (in mg/kg) – \nSelect and explain. \nA. 4, B. 6, C. 8, D. 10', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Different books have given different dose for IM route.', 'role': 'assistant'}]