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
Bruxism is characterized by: 
Select and explain. 
A. Increased mobility of the teeth, B. Radiographic widening of the pdl, C. Morning pain in muscles, D. All the above
D: All the above
Answer: D: All the above 
Explanation: None