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
[{'content': 'Change in structure and functions of a tissue is called: \nSelect and explain. \nA. Dysplasia, B. Metaplasia, C. Anaplasia, D. Aplasia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]