This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Metaplasia is induced from \nSelect and explain. \nA. Totipotent cells, B. Stem cells, C. Neoplastic cells, D. Necrotic cells', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Metaplasia is a reversible change in which one adult cell type (epithelial or mesenchymal) is replaced by another adult cell typeMetaplasia is thought to arise by reprogramming of stem cells to differentiate along a new pathway rather than a phenotypic change (transdifferentiation) of already differentiated cells( Robbins Basic Pathology, 9th edition, page 3 )', 'role': 'assistant'}]