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': 'A developer at high temperature will cause \nSelect and explain. \nA. Clear white spots on the film, B. Yellow stains, C. Very dark image, D. Very light image', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]