Which of the following is based upon the principle of antigen - antibody interaction?

Which of the following techniques is based upon the principle of antigen-antibody interaction ?

Which of the following techniques is based on the principles of antigen-antibody interaction?

Which of the following techniques is based on the principles of antigen-antibody interaction?

Transformer is based upon the principle of:

An electric iron is based upon the principle of

Assertion: PCR is a powerful technique to identify many genetic disroder Reason : ELISA is based on the principal of antigen antibody interaction