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(D) Early diagnosis of diseases is crucial for effective treatment,which is often not possible through conventional diagnostic methods (like serum and

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$I$,$II$ and $III$

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(D) Early diagnosis of diseases is crucial for effective treatment,which is often not possible through conventional diagnostic methods (like serum and urine analysis).The techniques used for early diagnosis include:$(i)$ Polymerase Chain Reaction $(PCR)$: It is used to detect very low concentrations of bacteria or viruses by amplifying their nucleic acids.$(ii)$ Recombinant $DNA$ technology: It is used in various diagnostic procedures to identify specific genetic markers.$(iii)$ Enzyme-Linked Immunosorbent Assay $(ELISA)$: It is based on the principle of antigen-antibody interaction,used to detect the presence of pathogens or antibodies produced against them.Therefore,all three techniques ($I$,$II$,and $III$) are used for early diagnosis.

Which of the following techniques serves the purpose of early diagnosis of $AIDS$,cancer,etc?
$I$. Polymerase chain reaction
$II$. Recombinant $DNA$ technology
$III$. Enzyme-linked immunosorbent assay
Choose the correct option.

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Which of the following techniques serves the purpose of early diagnosis of $AIDS$,cancer,etc?$I$. Polymerase chain reaction$II$. Recombinant $DNA$ technology$III$. Enzyme-linked immunosorbent assayChoose the correct option.