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
Bioterrorism group A agent 
Select and explain. 
A. Q fever, B. Typhus fever, C. Brucella, D. Anthrax
D: Anthrax
Answer: D: Anthrax 
Explanation: None