## **Core Concept**
The Pulse Polio Immunization (PPI) program is a nationwide campaign aimed at eradicating poliomyelitis (polio) by immunizing all children under the age of five against the poliovirus. This initiative involves administering multiple doses of the oral poliovirus vaccine (OPV) to build immunity.

## **Why the Correct Answer is Right**
The Pulse Polio Immunization program was launched in India in 1994. At that time, India was one of the countries with the highest number of polio cases. The program was a massive effort to immunize all children under five years of age against poliovirus through the administration of OPV. The campaign was conducted in phases, with multiple rounds of vaccination drives.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not correspond with the known initiation year of the Pulse Polio Immunization program in India.
- **Option B:** Similarly, this option does not align with the actual year the program was introduced.
- **Option D:** This option is also incorrect as it suggests a different year that does not match the historical data on the Pulse Polio Immunization program's launch.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the Pulse Polio Immunization program has been instrumental in reducing polio cases in India significantly. Due to such efforts, India was declared polio-free in 2014. The success of PPI campaigns underscores the importance of widespread vaccination in controlling and eliminating infectious diseases.

## **Correct Answer:** . 1994