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: Pathology
[{'content': 'Radiation caries develops in \nSelect and explain. \nA. 3 weeks, B. 3 days, C. 3 months, D. 3 years', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]