This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
Anthrax bacilli differs from anthracoid bacilli by being: 
Select and explain. 
A. Non-capsulated, B. Strict aerobe, C. Non-motile, D. Hemolytic colonies on blood
C: Non-motile
Answer: C: Non-motile 
Explanation: Ans. is 'c' i.e., Non motileRef:(Ananthanarayan, 8th/e, p. 393; 9th/e, p. 390-91)Differentiating features between anthrax and anthracoid bacilliAnthrax BacilliAnthracoid Bacilli* Nonmotile* Generally motile* Capsulated* Noncapsulated* Grow in long chains* Grow in short chains* Medusa head colony* Not present* No growth in penicillin agar (10 units/ml)* Grow usually* Hemolysis absent or weak* Usually well marked* Inverted fir tree growth and slow gelatin liquefaction* Rapid liquefaction* No turbidity in broth* Turbidity usual