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 dyskinesia may be caused by 
Select and explain. 
A. Complete loss of teeth, B. TMJ ankylosis, C. Herpes simplex infection, D. Pemphigus vulgaris
A: Complete loss of teeth
Answer: A: Complete loss of teeth 
Explanation: None