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 rigid reciprocal arm of a clasp may also act as: \nSelect and explain. \nA. Direct retainer, B. An auxiliary indirect retainer, C. Major connector, D. Minor connector', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]