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': 'Which among the following has great flexibility: \nSelect and explain. \nA. Cast circumferential clasp arm, B. Wrought circumferential clasp arm, C. Cast bar clasp arm, D. Wrought bar clasp arm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]