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': 'HDV is -0 \nSelect and explain. \nA. SS-RNA virus, B. SS_DNA virus, C. DS-RNA virus, D. DS-DNA virus', 'role': 'user'}, {'content': "Answer: A \nExplanation: HDV is a spherical 36 nm paicle with an outer coat composed of the hepatitis B ssurface antigen surrounding the circular single stranded RNA genome. REF:ANANTHANARAYAN AND PANIKER'S TEXTBOOK OF MICROBIOLOGY 9TH EDITION PAGE NO-549", 'role': 'assistant'}]