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': 'Iodised oil ( usual dose of 1 ml i/m) gives protection for \nSelect and explain. \nA. 3-4 years, B. 3-4 months, C. 3-4 weeks, D. 10-12 years', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Intramuscular Iodised Oil (poppy-seed oil): Average dose 1 ml injection provided protection for 4 years\nOral Iodised Oil: 2 ml dose is effective for 2 years', 'role': 'assistant'}]