The correct option is D All the above
The enzyme-linked immunosorbent assay (ELISA) is a biochemical technique used mainly in immunology to detect the presence of an antibody or an antigen in a sample. This test can be used to determine if one have antibodies related to certain infectious conditions. It is used to diagnose for Hepatitis-B, Syphilis, Gonorrhoea, AIDS, Pernicious anemia, Chicken pox etc. Thus, the correct answer is option D.