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': 'Retentive clasp arms should be placed on each abutment tooth such that \nSelect and explain. \nA. The retentive terminals are below the height of contact, B. There is a frictional fit on the surface of the abutment, C. They are in approximately the same degree of undercut, D. The retentive terminals are above the height of contour', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]