This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
[{'content': 'Characteristic feature of basal cell carcinoma is \nSelect and explain. \nA. Keratin pearls, B. Foam cells, C. Nuclear palisading, D. Psammoma bodies', 'role': 'user'}, {'content': "Answer: C \nExplanation: The characteristic finding is of ovoid cells in nests with a single 'palisading' layer. It is only the outer layer of cells that actively divide, explaining why tumour growth rates are slower than their cell cycle speed would suggest.Ref: Bailey and Love, 27e, page: 605", 'role': 'assistant'}]