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
Prevention of disease by immunization comes under which category 
Select and explain. 
A. Primordial prevention, B. Primary prevention, C. Secondary prevention, D. Teiary prevention
B: Primary prevention
Answer: B: Primary prevention 
Explanation: Primary prevention aims at preventing the progression of risk factors to disease. It includes health promotion and specific protection. Immunization comes under specific protection. Ref : Park&;s Textbook of Preventive and Social Medicine; 23rd edition - Pgno. 42