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': 'In bronchiectasis the following are seen except \nSelect and explain. \nA. Normal chest X-ray, B. Chest X-ray with cystic cavities and tramline appearance, C. Pleural effusion, D. Clubbing', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]