Which of the following diseases can be transmitted by droplets?

The transmission of diseases by droplets typically refers to the spread of infectious agents through respiratory droplets that are expelled when an infected person coughs, sneezes, or talks. Chicken pox, caused by the varicella-zoster virus, is an example of a disease that is transmitted via respiratory droplets. When a person with chicken pox coughs or sneezes, the virus can travel through the air and potentially infect others who are within close proximity.

On the other hand, brucellosis, which is caused by Brucella bacteria, is primarily transmitted through direct contact with infected animals or animal products, such as unpasteurized milk. It does not spread through respiratory droplets. Therefore, while chicken pox is a droplet-transmitted disease, brucellosis does not fit into that category, making chicken pox the only correct choice for this question.