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': 'Any clasp assembly should encircle at Least how much of the abutment tooth? \nSelect and explain. \nA. 120, B. 160, C. 180, D. 360', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]