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': 'In screening of oral cancer not true about exfoliative cytology is? \nSelect and explain. \nA. Keratin interrupts cell collection, B. It is not very good diagnostic toot, C. Greater numbers of cells are not superficial, D. Cells include trans-epithelial cells', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]