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': 'With regard to surgical site infection, what is it called if bacteria are dividing and have invaded wound surface \nSelect and explain. \nA. Contamination, B. Colonization, C. Tropical infection, D. Local infection', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Contamination\nBacteria are on the wound surface. No division occurring\n\n\nColonization\xa0\nBacteria are dividing\n\n\nTropical infection (Critical colonization)\nBacteria are dividing and have invaded the wound surface. There may be an increasing variety of bacteria present ; Biofilm may be present\n\n\nLocal infection\nBacteria and\xa0 / or their products have invaded the local tissue', 'role': 'assistant'}]