This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'HDV is \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: None', 'role': 'assistant'}]