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': 'Digital radiography requires less radiation than conventional radiography because: \nSelect and explain. \nA. The sensor is larger., B. The sensor is more sensitive to x-rays., C. The exposure time is increased., D. All of the above.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Digital radiography utilizes sensor which is more sensitive to X-rays than conventional film.', 'role': 'assistant'}]