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': 'A circumferential clasp arm: \nSelect and explain. \nA. Originates above the height of contour, B. Originates below the height of contour, C. Traverses soft tissue, D. Approaches undercut from gingival direction', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]