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: Surgery
[{'content': 'Characterstic 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: Basal cell carcinomas are composed of islands or nests of basaloid cells (i.e. cells resembling cells in the normal basal cell layer of the epidermis), with palisading of the cells at the periphery and a haphazard arrangement of those in the centers of the islands. The tumor cells have a hyperchromatic nucleus with relatively little, poorly defined cytoplasm. \nOther options:\nKeartin pearls- seen in squamous cell carcinoma\nFoam cells- seen in Xanthoma\nPsammoma bodies- seen in papillary thyroid carcinoma', 'role': 'assistant'}]