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: Radiology
[{'content': 'Most common type of radiation caries: \nSelect and explain. \nA. Superficial lesions involving all tooth surfaces, B. Cervical lesion, C. Dark pigmentation of the entire crown, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: All the given option are types of radiation-induced caries.\nKey Point:\nMost common type–Superﬁcial lesions involving all tooth surfaces.', 'role': 'assistant'}]