World Mosquito Day is observed annually on _____ date ?

1) August 17
2) August 18
3) August 20
4) August 19

Explanation:
World Mosquito Day is observed on 20 August 2019 to raise awareness about the diseases caused by the female mosquitoes. This day honor the British doctor Sir Ronald Ross’s groundbreaking discovery in 1897 that, female Anopheles mosquitoes transmit malaria between humans. The name, Mosquito comes from Spanish word meaning “little fly”.They spread diseases like malaria, West Nile virus, dengue, chikungunya, Zika among human beings.