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': 'Which of the following is an indication of complete veneer prosthesis as retainers for FPD? \nSelect and explain. \nA. Presence of extensive caries, B. Large defective restorations, C. Endodontically treated teeth, D. Long span fixed partial dentures', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Indications of complete veneer prosthesis as crown:\n\nPresence of extensive caries.\nLarge defective restorations.\nEndodontically treated teeth.\nFractured tooth.\nNeed to change contour for removable partial denture retention.\n\nIndications of complete veneer prosthesis as retainer for FPD:\n\nShort abutment.\nLong-span ﬁxed partial dentures.\xa0\nAbutment alignment needs correction.\nGreater than average occlusal forces.', 'role': 'assistant'}]