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: Forensic Medicine
[{'content': 'Crepitus over skin of the swollen limb should ale on possibility of: KCET 13 \nSelect and explain. \nA. Air embolism, B. Gas gangrene, C. Fat embolism, D. DIC', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Gas gangrene', 'role': 'assistant'}]