The correct option is B Both assertion and reason are true, but the reason is not the correct explanation.
A widely used diagnostic test for AIDS is ELISA (Enzyme linked Immuno-sorbent Assay). Blood samples are tested for antibodies and antigens. Positive ELISA tests are confirmed with Western blot test.
The treatment of AIDS is with antiretroviral drugs which are only partially effective. The drugs commonly used are Azidothymidine, Dideoxyinosine etc.