This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of Control, Subject name: Social & Preventive Medicine
Vaccine is what level of prevention: 
Select and explain. 
A. Primordial, B. Primary, C. Secondary, D. Tertiary
B: Primary
Answer: B: Primary 
Explanation: Ans. (b) PrimaryRef: K. Park 23rd ed. / 41, 370-74* All vaccines/immunization are primary level of prevention.* Refer to above table.