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': 'The disadvantage of standard cephalometric radiograph is that it \nSelect and explain. \nA. Has cumbersome developing and fixing procedure, B. Produces two dimensional representation of a three dimensional structure, C. Is difficult to handle the X-ray unit, D. Has high radiation hazard', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]