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
[{'content': 'Erysipelas is caused by ? \nSelect and explain. \nA. Staph aureus, B. Staph albus, C. Strep pyogenes, D. Hemophilus', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Strep pyogenes Erysipelas - is due to S. pyogenes and - is characterized by an abrupt onset of fiery-red swelling of the face or extremities. the distinctive features of erysipelas are well-defined indurated margins, paicularly along the nasolabial fold; rapid progression; and intense pain. extension to deeper soft tissues is rare. treatment with penicillin is effective", 'role': 'assistant'}]