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: Surgery
'Gas' in the tissue should be differentiated with ? 
Select and explain. 
A. Pseudomyxoma peritonei, B. Pseudomonas infection, C. Clostridium nouyi, D. Non clostridial infection
C: Clostridium nouyi
Answer: C: Clostridium nouyi 
Explanation: Ans. is 'c' i.e., Clostridium nouyi