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': 'Screen films differ from non-screen films by that: \nSelect and explain. \nA. They are more sensitive to light than x rays, B. They are more sensitive to X-rays than light, C. They are usually used in intra oral radiography, D. They do not need intensifying screens', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]