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': 'Major connector should be \nSelect and explain. \nA. Able to act as indirect retainer, B. Able to function as direct retainer, C. Rigid to connect bilateral components, D. Able to function as stress breakers', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]