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
Which of the following is associated with gas formation in sub cutaneous tissues? 
Select and explain. 
A. Clostridium, B. Borrelia, C. Staphylococcus, D. Streptococcus
A: Clostridium
Answer: A: Clostridium 
Explanation: Ans: a) ClostridiumClostridium perfringens is associated with gas gangrene or myonecrosis. These patients have bullous lesions and crepitations of the skin.Staphylococcus can produce subcutaneous emphysema only after the rupture of a pneumatocele (In Staph, pneumonia)