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
Oral submucous fibrosis is diagnosed by 
Select and explain. 
A. Juxta, epithelial fibrosis (Changes), B. Changes in epithelium, C. Changes in submucosa, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None