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
Gas gangrene is caused by all except- 
Select and explain. 
A. Cl. histolyticum, B. Cl. Novyi, C. Cl. septicum, D. Cl. sporogenes
D: Cl. sporogenes
Answer: D: Cl. sporogenes 
Explanation: None