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': 'In pantamograph, if patient chin is placed anterior to the focal trough, the structures appears to be \nSelect and explain. \nA. Blurred and Diminished, B. Blurred and Magnified, C. Either magnified or diminished, D. Only Blurred', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]