A Microbiologist Is Looking at a Sheep Blood Agar (SBA)

Multiple Choice

A microbiologist is looking at a sheep blood agar (SBA) plate from a patient who might have been exposed to a biological agent.The colonies that are growing on the plate are nonhemolytic, large, have a ground-glass appearance, and look like a Medusa's head.On Gram stain, the colonies are large gram-positive rods that seem to have central spores.What is the most probable organism?

A) Bacillus anthracis
B) Brucella mallei
C) Burkholderia cepacia
D) Yersinia pestis