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': 'Childhood obesity prevention is a type of? \nSelect and explain. \nA. Primordial prevention, B. Primary prevention, C. Secondary prevention, D. Tertiary prevention', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]