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': 'Skin grafting is absolutely C/I in which skin infection- \nSelect and explain. \nA. Staphylococus, B. Pseudomonas, C. Streptococus, D. Proteus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: "The skin graft generally survives when placed over the wounds containing less than 105 organisms per gram of tissue unless the organisms are streptococci, which can rapidly dissolve transplanted skin." - S. Das 3/e, p 142', 'role': 'assistant'}]