Which practice involves introducing a vaccine to the body?

The correct choice is vaccination, as it specifically refers to the process of introducing a vaccine into the body to stimulate an immune response against disease. Vaccination is a preventive measure aimed at building immunity by exposing the immune system to a harmless component of the pathogen, which prepares the body to fight off future infections.

While inoculation can sometimes be used interchangeably with vaccination, it more broadly refers to the introduction of any substance into the body, not specifically a vaccine. Immunization is the broader outcome of the vaccination process, whereby the immune system learns to recognize and combat pathogens, but it does not strictly denote the act of introducing a vaccine. Quarantine is a public health practice aimed at isolating individuals who may have been exposed to a contagious disease, which does not involve the administration of vaccines. Thus, vaccination is the most precise term to describe the act of introducing a vaccine into the body.