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 most important cause of failure of patient to wear RPD is due to: \nSelect and explain. \nA. Indifferent patient education, B. Faulty laboratory procedures, C. Poor framework design, D. Improper preliminary rehabilitative restorative procedures', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]