Correct Answer: vaccination of children

Solution : The correct option is the vaccination of children.

In India, the 'Mission Indradhanush' programme is related to immunisation and vaccination. The initiative seeks to provide children up to the age of two with a comprehensive immunisation schedule, including vaccinations for illnesses such as polio, measles, tetanus, and hepatitis, among others. The objective is to protect more children against vaccine-preventable diseases lowering child mortality, and increasing general public health.