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: ENT
[{'content': 'To prevent synachiae formation after nasal surgery, which one of the following packings is the most useful: \nSelect and explain. \nA. Mitomycin, B. Ribbon gauze, C. Ribbon gauze with liquid paraffin, D. Ribbon gauze steroids', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]