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
The term metaplasia refers to 
Select and explain. 
A. Irregular, atypical proliferative changes in epithelial or mesenchymal cells, B. Loss of cell substance producing shrinkage of the cells, C. Replacement of one type of adult cell by another type of adult cell, D. None of the above
C: Replacement of one type of adult cell by another type of adult cell
Answer: C: Replacement of one type of adult cell by another type of adult cell 
Explanation: None