This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
60 yr old male presented with dysphagia. Mucosal biopsy is provided here which show? 
Select and explain. 
A. Squamous metaplasia, B. Columnar metaplasia, C. Anaplasia, D. Connective tissue metaplasia
B: Columnar metaplasia
Answer: B: Columnar metaplasia 
Explanation: .