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
Features of a benign tumour are all EXCEPT 
Select and explain. 
A. Absence of hyperchromasia of nucleus, B. Retained basal polarity, C. Slow growth, D. Presence of local invasion
D: Presence of local invasion
Answer: D: Presence of local invasion 
Explanation: None