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': 'Which of the following is true about X-ray chest: \nSelect and explain. \nA. Right hilum is lower than the left hilum, B. Right dome of diaphragm is lower than the left, C. Pulmonary aeries normally extend upto the periphery of the lung field, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Right hilum is lower than the left hilum', 'role': 'assistant'}]