This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics, Subject name: Pathology
[{'content': 'Effective polymerase reaction was repeated for 3 cycles on a DNA molecule. What will be the resulting formation of the copies? \nSelect and explain. \nA. Double number of copies, B. Three times the number of DNA molecule, C. Four times the number of DNA molecule, D. Eight times', 'role': 'user'}, {'content': "Answer: D \nExplanation: Polymerase Chain Reaction The number of copies of the paicle after 'n' cycles of Polymerase Chain Reaction is given by the formula 2n times the original copies. So, the number of copies after 3 cycles would be 23 =8 times the original copies. PCR is used to amplify DNA but - PCR (reverse transcriptase PCR) can be used for studying mRNA.", 'role': 'assistant'}]