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': 'Microorganism used as weapon in biological terrorism \nSelect and explain. \nA. Small pox Virus, B. Rabies Virus, C. Herpes Virus, D. Influenza C Virus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: * Bioterrorism agents -variola (Smallpox), F. tularensis, bacilli anthracis, Clostridium botulinum,Y.pestis, Ebola virus', 'role': 'assistant'}]