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 for panoramic radiograph is: \nSelect and explain. \nA. 0.94 mGy, B. 0.074 mGy, C. 0.074 microGy, D. 0.74 mGy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Thyroid dose for panoramic radiograph is 0.074 mGy.\nWhite and Pharoah 5th ed pg -234', 'role': 'assistant'}]