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': 'The tendency for drifting of posterior teeth into extraction space is more in \nSelect and explain. \nA. Mandible, B. Maxilla, C. Maxilla and Mandible, D. Primary than Permanent teeth', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]