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The technique used for estimation of minute amounts of hormones and drugs is called

1. electrophoresis
2. electroencephalogram
3. fractionation
4. radioimmunoassay

Correct answer: radioimmunoassay

Solution

Radioimmunoassay is designed to measure very small quantities of hormones, drugs, and other molecules by using antigen-antibody binding with a radioactive tracer. Its high sensitivity makes it ideal for minute concentrations that other techniques may miss.

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