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': 'In a preadolescent child, the maximum midline diastema that will be closed spontaneously after canine eruption: \nSelect and explain. \nA. 1 mm, B. 2 mm, C. 4 mm, D. 5 mm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The maximum midline diastema that will be closed\xa0spontaneously after canine eruption is not more than 2 mm.\xa0\nThis is an example of transient malocclusion.', 'role': 'assistant'}]