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: Unknown
[{'content': 'Lack of differentiation is called: \nSelect and explain. \nA. Anaplasia, B. Metaplasia, C. Dysplasia, D. Carcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref. Robbins Pathology. 9th edition. Page. 269 \nDifferentiation refers to the extent to which neoplastic parenchymal cells resemble the corresponding normal parenchymal cells, both morphologically and function- ally; lack of differentiation is called anaplasia', 'role': 'assistant'}]