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
The main causative organism of Gas gangrene is 
Select and explain. 
A. Bacillus anthrax, B. Cloastridium tetani, C. Clostridium defficile, D. Clostridium perfringens
D: Clostridium perfringens
Answer: D: Clostridium perfringens 
Explanation: Gas gangrene is caused by Clostridium PerfringensRef: Harrison&;s Principles of Internal Medicine; 19th edition; Chapter 156; Infections of the Skin, Muscles, and Soft Tissues