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': 'When designing a RPD for Kennedy Class-II arch, the clasp configuration usually employed is \nSelect and explain. \nA. Unilateral, B. Tripod, C. Bilateral, D. Quadrilateral', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]