This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bronchiectasis, Subject name: Medicine
[{'content': 'Which is the most common type of bronchiectasis? \nSelect and explain. \nA. Cylindrical, B. Varicose, C. Cystic, D. Irregular', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most common type of bronchiectasis is the cylindrical type.', 'role': 'assistant'}]