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': 'HTLV extyra gene is - \nSelect and explain. \nA. Gag, B. Pol, C. ENV, D. px', 'role': 'user'}, {'content': "Answer: D \nExplanation: some retrovirus such as HTLV and HIV carry a fouh gene tex or tat after the env gene REF:ANANTHANARAYAN AND PANIKER'S TEXTBOOK OF MICROBIOLOGY 9TH EDITION PAGE NO:567", 'role': 'assistant'}]