Explanation:

- The Serum Institute of India is renowned for producing vaccines and has made significant contributions to global health.

- The oral polio vaccine (OPV) is crucial in the fight against polio, a disease that primarily affects children.

- Option:1, 2012 - This is not the year the Serum Institute launched the OPV.

- Option:2, 2013 - Correct year for the launch of the oral polio vaccine by the Serum Institute of India.

- Option:3, 2014 - This year does not match the launch year of the OPV by the Serum Institute.

- Option:4, 2011 - Incorrect, as it precedes the actual launch year.

Correct Answer: Option:2, 2013