The correct option is C January 28
President Ram Nath Kovind had launched the countrywide Pulse Polio programme for 2018 by administering polio drops to children below five years at the Rashtrapati Bhavan in New Delhi. The programme will cover around 17 crore children to maintain the country's polio-free status. The president administered the drops on the eve of 2018 National Immunisation Day (NID), which was observed on January 28.