Let's match each item in List-A with the appropriate term from List-B:
\begin{itemize}
\item A. Forensic science → IV. DNA fingerprinting
DNA fingerprinting is a core technique used in forensic science for identifying individuals.
\item B. Antigen-antibody interaction → III. ELISA
ELISA (Enzyme-Linked Immunosorbent Assay) is used to detect antigen-antibody interactions.
\item C. Detection of HIV → II. PCR
PCR (Polymerase Chain Reaction) is used to amplify and detect viral genetic material, including HIV.
\item D. Gene insertion into cells to treat disease → I. Gene therapy
Gene therapy involves inserting functional genes into a patient's cells to treat genetic disorders.
\end{itemize}
So the correct match is:
A–IV, B–III, C–II, D–I