Concept:Anthrax is a serious bacterial infection of farm animals caused by a specific spore-forming bacterium.
Explanation:The causal organism of anthrax is
Bacillus anthracis.
It is a rod-shaped, Gram-positive bacterium that produces highly resistant spores.
These spores can survive in soil for many years and infect cattle, sheep, goats, and other farm animals.
Brucella abortus causes brucellosis, not anthrax.
Mycobacterium spp. causes tuberculosis.
Aspergillus spp. is a fungus.
Hence, only option A names the correct pathogen.
Answer:A.
Bacillus anthracis