This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'Medusahead appearance on agar plates is characteristic of \nSelect and explain. \nA. Hemophilus, B. Pneumococcus, C. Bacillus, D. Yersinia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: When grown on blood agar plates, Bacillus anthracis produce nonhemolytic grey 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.Jawetz 27e pg: 180', 'role': 'assistant'}]