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
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: Ans. is 'b' i.e., Primary prevention