Final answer:
The most common reagents used in PCR are DNA template, primers, DNA polymerase, dNTPs, and fluorescently labeled ddNTPs.
Step-by-step explanation:
The most common reagents used in PCR (Polymerase Chain Reaction) are DNA template, primers, DNA polymerase, dNTPs (deoxynucleotide triphosphates), and fluorescently labeled ddNTPs (dideoxynucleotide triphosphates).