Which of the following diseases is caused by a virus?

The correct answer is associated with influenza, a disease caused by the influenza virus. Viruses are unique infectious agents that require living host cells to replicate, and they can cause a variety of diseases, ranging from mild to severe. Influenza specifically is known for its seasonal outbreaks and is characterized by symptoms such as fever, cough, and body aches, caused by the viral infection affecting the respiratory system.

In contrast, coronary artery disease is primarily related to factors such as high blood pressure, cholesterol, and lifestyle choices, rather than infectious causes. Tuberculosis is a bacterial infection caused by Mycobacterium tuberculosis, which primarily affects the lungs. Strep throat is caused by the bacterium Streptococcus pyogenes, and it results in a sore throat and other throat-related symptoms.

Thus, influenza stands out as the only disease listed that is caused specifically by a virus, exemplifying the infectious nature of viral pathogens and their impact on human health.