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
Micro-organism used as weapon in biological terrorism - 
Select and explain. 
A. Small pox V, B. Rabies V, C. Ebola V, D. Influenza CV
A: Small pox V
Answer: A: Small pox V 
Explanation: None