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 oral mucosa becomes rigid, blanched and opaque in which of the following conditions? 
Select and explain. 
A. Pemphigus vulgaris, B. Lupus erythematoses, C. Ehlers-Danlos syndrome, D. Submucous fibrosis
D: Submucous fibrosis
Answer: D: Submucous fibrosis 
Explanation: None