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: Social & Preventive Medicine
Prophylaxis for anthrax 
Select and explain. 
A. Erythromycin, B. Doxycycline, C. Penicillin, D. Vancomycin
B: Doxycycline
Answer: B: Doxycycline 
Explanation: None