This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Radiology
[{'content': 'Radiation dose monitoring in occupational personal is done by \nSelect and explain. \nA. TLD Badge, B. Linear accelerator, C. Collimators, D. Grid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ref : david sutton', 'role': 'assistant'}]