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': 'Thyroid dose from panoramic radiography is about: \nSelect and explain. \nA. 22 Gy, B. 34 μGy, C. 51 μGy, D. 74 μGy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]