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': 'Fresh film, stored precisely on exposure will show? \nSelect and explain. \nA. Blackened, B. Fogged, C. Cloudy with blue tint, D. Clear with blue tint', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]