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
A patient comes to your clinic with complaint of food, lodgement/sticking in interproxlmal area of 47. On intra-oral examination, 47 is restored with disto- occlusal amalgam restoration. What can be the most probable reason for patient problem? 
Select and explain. 
A. Contact area placed more gingivally, B. Occlusogingivally contact area become wide, C. Bucco-lingually contact area wide, D. Contact area placed more occlusally
D: Contact area placed more occlusally
Answer: D: Contact area placed more occlusally 
Explanation: None