Vaccines provide protection against which of the following diseases?

Vaccines are specifically developed to stimulate the immune system to protect against infectious diseases caused by viruses and bacteria. The combination of measles, mumps, and rubella vaccines is one of the most well-known vaccinations administered during childhood to provide immunity against these three viral infections. Vaccination against these diseases is crucial as they can lead to severe complications such as deafness, encephalitis, and other significant health issues.

In contrast, hypertension is a chronic condition related to blood pressure and is not preventable through vaccination. Obesity is influenced by various lifestyle factors, including diet and physical activity, rather than an infectious agent. AIDS, caused by the human immunodeficiency virus (HIV), currently does not have a vaccine available for widespread use, although research is ongoing. Thus, the correct answer highlights the importance of vaccines in controlling and preventing specific contagious diseases like measles, mumps, and rubella.