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
Acute emphysematous cholecystitis is caused by - rpt 
Select and explain. 
A. Pseudomonas aeruginosa, B. Staph. Aureus, C. Clostridium perfringes, D. Strep. Pyocynacae
C: Clostridium perfringes
Answer: C: Clostridium perfringes 
Explanation: Question repeated.