How does the use of non-specific proteins like casein in ELISA contribute to the accuracy of the assay?

• A. By preventing non-specific binding of antibodies, ensuring that only specific interactions are measured.
• B. By increasing the binding affinity of the primary antibody to the antigen.
• C. By facilitating the removal of unbound antibodies during washing steps.
• D. By enhancing the enzymatic activity of the secondary antibody.

Answer: (A)