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 success of FPD is depended upon : \nSelect and explain. \nA. The material used., B. Degree of tissue contact., C. Both., D. None.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]