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: Pathology
[{'content': "A surgeon removed section of tissues how would he confirm that cut margin doesn't contain any suspicious tissue intraoperatively? \nSelect and explain. \nA. Punch biopsy, B. Brush biopsy, C. Frozen section, D. Exfoliative cytology", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]