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': 'A patient has increased number of columnar cells in lower esophagus. He has which of the following change: \nSelect and explain. \nA. Dysplasia, B. Anaplasia, C. Metaplasia, D. Normal histology', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]