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The PCR technique can be applied only to DNA strands. However, with the help of reverse transcriptase, RNA can be transcribed into DNA, thus making PCR analysis of RNA molecules possible.
The product of reverse transcriptase is a cDNA. RT-PCR that is Reverse transcriptase PCR can help in creating cDNA libraries thus it can also be used for the analysis of reverse transcriptase product. This is due to its ability to transcribe RNA in to DNA. So a PCR techqiue is the best option.