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': 'Relief under a maxillary major connector \nSelect and explain. \nA. Is generally not required, B. Is required, C. May be used, D. May not be used', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]