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': 'X-rays films are insensitive to which light? \nSelect and explain. \nA. Yellow and Red, B. Red, C. White, D. Blue and green', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]