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: Medicine
[{'content': 'Bronchiectasis is most common in which lobe - \nSelect and explain. \nA. Right upper lobe, B. Right middle lobe, C. Left upper lobe, D. Left lower lobe', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]