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': 'The atom which scatters X-rays more is: \nSelect and explain. \nA. Carbon, B. Mercury, C. Lead, D. Hydrogen', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Hydrogen', 'role': 'assistant'}]