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': 'Radiation induced caries occurs in? \nSelect and explain. \nA. 1 month, B. 3 months, C. 6 months, D. 9 months', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Radiation-related caries and other dental hard tissue changes can appear within the first 3 months following RT.\nRef: Gupta N, Pal M, Rawat S, et al. Radiation-induced dental caries, prevention and treatment - A systematic review. Natl J Maxillofac Surg. 2015;6(2):160-166. doi:10.4103/0975-5950.183870', 'role': 'assistant'}]