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
Radiation induced caries occurs in? 
Select and explain. 
A. 1 month, B. 3 months, C. 6 months, D. 9 months
B: 3 months
Answer: B: 3 months 
Explanation: Radiation-related caries and other dental hard tissue changes can appear within the first 3 months following RT.
Ref: 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