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': 'Under RCH programme, intervention done in selected districts \nSelect and explain. \nA. Treatment of STD, B. Immunization, C. ORS therapy, D. Vitamin A supplementation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]