Question

which describes hiv/aids?
an acute disease
a bacterial disease
a rare disease
a disease of the immune system

Explanation:

HIV is a virus that attacks the immune system. AIDS is the most advanced stage of HIV infection. It is not an acute disease (which has a sudden onset and short course), not a bacterial disease (it's viral), and not rare (it's a global health concern). It specifically affects the immune system.

Answer:

A disease of the immune system