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
Category A bioterrorism agents are 
Select and explain. 
A. Ebola, B. Yersinia, C. Clostridium botulinum, D. Rickettsia
A: Ebola
Answer: A: Ebola 
Explanation: Category A bioterrorism agents include - 1. Smallpox- various virus 2. Tularemia- Francisella tularensis 3. Anthrax- bacillus anthracis 4. Botulinum toxin- Clostridium botulinum 5. Bubonic plague- yersinia pedis 6. Viral haemorrhage fever- filoviridae (Marburg virus and Ebola virus) Ref: Baveja textbook of microbiology; 4th edition