The correct option is A World Immunisation Day
World Immunization Day is celebrated every year on November 10. This day is celebrated to make people aware of the importance of getting timely vaccinations against vaccine-preventable diseases. According to World Health Organisation, Immunization is a proven tool for controlling and eliminating life-threatening infectious diseases and is estimated to avert between 2 and 3 million deaths each year but an estimated 18.7 million infants worldwide are still missing out on basic vaccines.