The correct option is D ELISA
AIDS can be detected by an ELISA test as it works on the principle of antigen-antibody interaction. Antigen-Antibody interaction is highly sensitive, which makes it easy for the detection of HIV in blood. When a person is infected with the virus, the body creates specific antibodies against the virus as a first response mechanism. Bases on the antigen-antibody interaction, an ELISA can be used to confirm the antibodies made against HIV thereby confirming the HIV status of an individual.