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': "Unilateral edentulous area with natural teeth both anterior and posterior to it represent Kennedy's arch. \nSelect and explain. \nA. Class I, B. Class II, C. Class III, D. Class IV", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]