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': 'Type of external root resorption occur in concussion and subluxation: \nSelect and explain. \nA. Surface resorption, B. Replacement resorption, C. Ankylosis resorption, D. Inflammatory root resorption', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]