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 occlusion in an obturator appliance of elderly patient should be? \nSelect and explain. \nA. Balanced towards the kesion, B. Margin to fossa, C. Monoplane, D. Cusp to cusp', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]