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: Dental
Pain and sensitivity in a tooth with onlay after 4 months is due to: 
Select and explain. 
A. Supra occlusion, B. Gingivitis, C. Infra occlusion, D. None of the above
A: Supra occlusion
Answer: A: Supra occlusion 
Explanation: None