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': 'Features of a benign tumour are all EXCEPT \nSelect and explain. \nA. Absence of hyperchromasia of nucleus, B. Retained basal polarity, C. Slow growth, D. Presence of local invasion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]