The question asks which disease is spread by air from the given options. Let's analyze each option and identify the correct answer:
Small Pox: Smallpox is an infectious disease caused by the variola virus. It spreads through respiratory droplets when an infected person coughs, sneezes, or talks. Due to the airborne mode of transmission, smallpox can spread from person to person.
Cholera: Cholera is mainly spread through contaminated water and food, not through the air. It is caused by the bacterium Vibrio cholerae, leading to severe watery diarrhea.
Plague: The plague is caused by the bacterium Yersinia pestis and can spread through flea bites, contact with contaminated fluid or tissue, and respiratory droplets from an infected person or animal, but it is primarily associated with the bubonic form which is not airborne.
Rickets: Rickets is not an infectious disease but a disease caused by a deficiency in vitamin D, calcium, or phosphate, affecting bone development in children. It is not spread through air or any form of transmission between people.
Based on the analysis, the correct option is the one related to airborne transmission. Therefore, Small Pox is the correct answer as it spreads through the air via respiratory droplets.
