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 intraoral factor for the indication of RPD? \nSelect and explain. \nA. Distal extension situations, B. Long edentulous span, C. Cross arch stabilization, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]