31 May is celebrated as -

Answer: Option A

World No Tobacco Day (WNTD) is observed around the world every year on 31 May. This yearly celebration informs the public on the dangers of using tobacco, the business practices of tobacco companies, what the World Health Organization (WHO) is doing to fight against the use of tobacco, and what people around the world can do to claim their right to health and healthy living and to protect future generations.