This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Inverted fir tree appearance on gelatin stab is characteristic of ? 
Select and explain. 
A. Mycoplasma, B. Bacillus anthracis, C. Clostridium, D. Bacteriodes
B: Bacillus anthracis
Answer: B: Bacillus anthracis 
Explanation: None