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': 'The design for a maxillary cast RPD frame work with a double bar (anteriorly and posteriorly) type of major connector is indicated when: \nSelect and explain. \nA. Maximum palatal support is required, B. High vault type of palate, C. Acrylic plate for palate is to be used, D. Where a single palatal bar connector would flex', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]