The varicella vaccine is routinely given to children to prevent a disease called chickenpox. this vaccine is an example of therapeutic use. diagnostic use. prophylaxis. pharmacology.

The correct answer is- prophylaxis

Explanation:

Prophylaxis is a type of treatment that is used as a preventive measure to avoid a particular disease to occur. Vaccine is produced from pathogenic antigen whose virulence or disease-causing ability is destroyed but its capability to initiate immune response in the host is retained.

Vaccine prevents a particular disease to occur by providing acquired immunity to the host. When vaccines are injected in any person it initiates an immune response against it which makes memory cells against the antigen present in the vaccine.

So when this antigen enters the body again in the future our immune system recognizes it quickly and destroys the antigen. So as vaccines prevent disease, therefore, it is an example of prophylaxis.