<prompt> Medusa head appearance is a feature ofBacillus subtilisBacillus stearothermophilusBacillus cereusBacillus anthracis  <response>: Bacillus anthracis:When grown on blood agar plates, the organisms produce nonhemolytic gray to white, tenacious colonies with a rough texture and a ground-glass appearance. Comma-shaped outgrowths Medusa head, curled hair may project from the colony.Reference: Jawetz, Melnick, Adelbergs Medical Microbiology; 27th edition; Chapter 11; Spore-Forming Gram-Positive Bacilli: Bacillus and Clostridium Species 