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': 'At DEJ most of the joints are: \nSelect and explain. \nA. Gap joint., B. Edge to edge., C. Butt joint., D. Overlap joint.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]