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
Microorganism used as weapon in biological terrorism is - rpt 
Select and explain. 
A. Smallpox virus, B. Rabies virus, C. Influenzae virus, D. Human narvovirus
A: Smallpox virus
Answer: A: Smallpox virus 
Explanation: *small pox (variola) is a category A bioterrorism agent. REF:Baveja textbook of microbiology 4th edition.