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': 'Extrusion of sealer from root apex will cause \nSelect and explain. \nA. Irritate tissue and delay healing, B. Stain periapical tissue, C. Resorb the root, D. Lead to closure of apex', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]