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': 'Crimp marks in a radiograph are due to: \nSelect and explain. \nA. Droplets of fixing solution, B. Droplets of developing solution, C. Static electricity, D. Sharp bending of the film', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]