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': "Black Triangles' act as a source of plaque accumulation and flossing interference, this should be treated by: \nSelect and explain. \nA. Fill the entire embrasure space with pink porcelain, B. Andrew's bridge system can be given, C. Large pontics can be given, D. Both 1 & 2", 'role': 'user'}, {'content': "Answer: D \nExplanation: Black Triangles’ can be treated by:\n\nFilling the entire embrasure space with pink porcelain.\nAndrew's bridge system\nIncreasing the connector height\n\nLoss of residual ridge contour may lead to unesthetic\xa0open\xa0gingival\xa0embrasures\xa0(“black triangles”), food impaction and percolation of saliva during speech.", 'role': 'assistant'}]