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
Vaccine is what level of prevention 
Select and explain. 
A. Primordial, B. Primary, C. Secondary, D. Tertiary
B: Primary
Answer: B: Primary 
Explanation: All vaccines/immunization are primary level of prevention.