This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: mycology, Subject name: Microbiology
[{'content': 'Microorganism used as weapon in biological terrorism is - rpt \nSelect and explain. \nA. Smallpox virus, B. Rabies virus, C. Influenzae virus, D. Human narvovirus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: *small pox (variola) is a category A bioterrorism agent. REF:Baveja textbook of microbiology 4th edition.', 'role': 'assistant'}]