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': 'Traumatic injury to primary tooth Leads to intrusion,\nafter how much time the teeth usually re-erupts? \nSelect and explain. \nA. 30 Days, B. 3 Months, C. 6 Months, D. 12 Months', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]