This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
All are motile except? 
Select and explain. 
A. CI. histolyticum, B. CI. Tetanosporum, C. CI. perfringens, D. CI. septicum
C: CI. perfringens
Answer: C: CI. perfringens 
Explanation: It is a pump Gram-positive bacillus was straight parallel sides and rounded or truncated ends about 4-6 x1 um in size usually occurring singly or in chains or small bundles. It is pleomorphic and filamentous and involution forms are common it is capsulated and nonmotile Ref: Ananthanarayan & paniker's Textbook of Microbiology 9th edition pg no 253