Medical Diagnostics

Polymerase Chain Reaction (PCR) is a cornerstone of modern diagnostics due to its ability to amplify trace amounts of bacterial or viral DNA/RNA, enabling early detection even before symptoms appear.

Unlike serum analyzers (A), which detect antibodies or metabolites, or CT scans (D), which visualize structural changes, PCR identifies the pathogen’s genetic material directly. DNA sequencers (B) are used for detailed genomic analysis but are less practical for rapid diagnostics.

PCR’s sensitivity and specificity make it indispensable for detecting infections like COVID-19, HIV, and tuberculosis.

The correct answer is (C) PCR.