This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of health and disease, Subject name: Social & Preventive Medicine
[{'content': 'Chemoprophylaxis is ________ prevention \nSelect and explain. \nA. Primordial, B. Primary, C. Secondary, D. Teiary', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Primary prevention aims at preventing the progression of risk factors to disease Ref : Park&;s Textbook of Preventive and Social Medicine; 23rd edition - Pgno. 41', 'role': 'assistant'}]