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
Which is a reversible change - 
Select and explain. 
A. Metaplasia, B. Anaplasia, C. Dysplasia, D. All of the above
A: Metaplasia
Answer: A: Metaplasia 
Explanation: Dysplasia means disordered (abnormal) growth. It is partially reversible i.e. reversible in early stage and irreversible in the later stage.
Metaplasia is an adaptive change in which one adult (mature) cell type is replaced by another adult (mature) cell. It is completely reversible.
Anaplasia means lack of differentiation. Anaplasia is considered as a hallmark of malignant transformation. It is irreversible.