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
A patient has increased number of columnar cells in lower esophagus. He has which of the following change: 
Select and explain. 
A. Dysplasia, B. Anaplasia, C. Metaplasia, D. Normal histology
C: Metaplasia
Answer: C: Metaplasia 
Explanation: None