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
Polio vaccine is which type of prevention: 
Select and explain. 
A. Primary, B. Secondary, C. Tertiary, D. Primordial
A: Primary
Answer: A: Primary 
Explanation: Ans. (a) PrimaryRef.: K. Park 23rd ed. 141, 370-74