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': "Circumferential clasp is \nSelect and explain. \nA. Aker's clasp, B. Retentive arm Lies at the occlusal third, C. Clasp can be easily adjusted, D. Encircles the tooth from the point of origin", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]