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
Crimp marks in a radiograph are due to: 
Select and explain. 
A. Droplets of fixing solution, B. Droplets of developing solution, C. Static electricity, D. Sharp bending of the film
D: Sharp bending of the film
Answer: D: Sharp bending of the film 
Explanation: None