This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Clostridium, Subject name: Microbiology
Most common cause of gas gangrene - 
Select and explain. 
A. Cl welchii, B. Clsepticum, C. Clnovyi, D. Clhistolyticum
A: Cl welchii
Answer: A: Cl welchii 
Explanation: Ans. is 'a' i.e., Cl welchii o Most common cause of gas gangrene is Cl perfringens (Cl welchii) causing 80% of cases of gas gangrene,o Other causes are Cl septicum, Cl novyi and Cl histolyticum.