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': 'Among the following, examples of non-ionising radiation \nSelect and explain. \nA. UV, B. X-rays, C. Gamma rays, D. Cosmic rays', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]