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: Medicine
Crepitus in a wound is produced by - 
Select and explain. 
A. Staph aureus, B. Clostridium tetani, C. Clostridium welchii, D. Pseudomonas
C: Clostridium welchii
Answer: C: Clostridium welchii 
Explanation: None