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': 'Amount of relief depends upon : \nSelect and explain. \nA. Type of RPD., B. The slope of lingual tissue., C. Both., D. A number of teeth remaining.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]