All of the Following Are Correct About the Indirect ELISA

Multiple Choice

All of the following are correct about the indirect ELISA, except:

A) it can detect antibodies in a serum sample.
B) it is the common screening test for antibodies to Helicobacter.
C) color development indicates that antibody was not present in the patient's serum.
D) it is the common screening test for antibodies to hepatitis A.
E) a known antigen is adsorbed to the surface of a well.