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': 'Which of the following is not an inherent property of radiograph: \nSelect and explain. \nA. Definition, B. Contrast, C. Density, D. Sharpness', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 3 inherent qualities of radiograph are:\n\nDefinition\nContrast\nDensity', 'role': 'assistant'}]