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': 'Micro-organism used as weapon in biological terrorism - \nSelect and explain. \nA. Small pox V, B. Rabies V, C. Ebola V, D. Influenza CV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]