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': 'An important factor that aids in stability of complete denture is \nSelect and explain. \nA. Harmonious occlusion, B. Proper extension of denture bases, C. Polishing of denture bases, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]