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 most common error seen during access cavity preparation of maxillary and mandibular incisors is: \nSelect and explain. \nA. Perforation of the lingual or labial walls, B. Gouging of pulpal contents, C. Tooth fracture, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]