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
Which of the following interactions does not cause film fog? 
Select and explain. 
A. Coherent scattering, B. Transient scattering, C. Photoelectric absorption, D. Compton scattering
C: Photoelectric absorption
Answer: C: Photoelectric absorption 
Explanation: None