This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Levels of Prevention of Disease, Subject name: Social & Preventive Medicine
[{'content': 'The most cost-effective mode of intervention for prevention of disease is: \nSelect and explain. \nA. Health education, B. Environmental modifications, C. Nutritional interventions, D. Lifestyle and behavioral changes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Health education is one of the most cost- effective interventions. A large number of diseases could be prevented if people were adequately informed & if they were encouraged to take necessary precautions in time.', 'role': 'assistant'}]