Ingrid Anderson presents with a skin infection that began as a raised itchy bump, resembling an insect bite Within 1 to

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Ingrid Anderson presents with a skin infection that began as a raised itchy bump, resembling an insect bite Within 1 to 2 days it developed into a vesicle. Now it is a painless ulcer, about 2 cm in diameter, with a black necrotic area in the center. During the history, her doctor learns that she may has recently returned from an overseas vacation and becomes concerned that she may have become infected with anthrax. He will prescribe an

A. antibiotic
B. antineoplastic
C. antiparasitic
D. antiviral