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': 'On the interaction of X-ray with matter; Phenomenon occurring maximally is: \nSelect and explain. \nA. Compton scattering, B. Photoelectric emission, C. Coherent Scattering, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]