This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'Reverse transcriptase is an enzyme unique to the retroviruses. Which one of the following is a function of the enzyme reverse transcriptase? \nSelect and explain. \nA. DNase activity, B. RNA-dependent RNA polymerase activity, C. RNA isomerase activity, D. RNA-dependent DNA polymerase activity', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The replication of a retroviral genome is dependent on the reverse transcriptase enzyme, which performs a variety of functions. It builds a complementary strand of DNA for the viral RNA template; it builds a second DNA strand complementary to the previous DNA; it degrades the original RNA, leaving a DNA-DNA duplex; and, finally, it is responsible for integrating the new viral DNA hybrid into the host genome.', 'role': 'assistant'}]