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
[{'content': "A 45 year old female patient returns to your clinic with complaint of food lodgement in interproximal area of 47. On intraoral examination, 47 is restored with disto-occlusal amalgam restoration. What can be the most probable reason for this patient's  problem? \nSelect and explain. \nA. Contact area placed more gingivally, B. Occluso-gingivally contact area is wide, C. Bucco-linguallly contact area is wide, D. Contact area placed more occlusally", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Proximal surface restorations often display an\xa0 occlusogingival\xa0 proximal\xa0 contour\xa0that\xa0is\xa0too\xa0straight, thereby causing the contact relationship to be located too far occlusally (with little or no occlusal embrasure). This condition\xa0allows\xa0food\xa0impaction\xa0betwee\xa0teeth\xa0with\xa0resultant injury\xa0to\xa0the\xa0interproximal\xa0gingiva\xa0and\xa0supporting\xa0tissues\xa0and invites caries.', 'role': 'assistant'}]