Question

what causes tuberculosis?
an antigen
a bacterial infection
a viral infection

Explanation:

Tuberculosis (TB) is caused by the bacterium Mycobacterium tuberculosis. An antigen is a substance that induces an immune response, not a causative agent of TB. A viral infection is caused by viruses, while TB is bacterial. So the correct option is the one about bacterial infection.

Answer:

B. A bacterial infection