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 complete clasp assembly consists of a \nSelect and explain. \nA. Retentive arm and a reciprocal arm, B. Circumferential arm and a bar-type arm, C. Proximal plate and a retentive arm, D. Retentive arm, an occlusal rest, and reciprocating elements', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]