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': "Rasmussen's aneurysm which artery is involved \nSelect and explain. \nA. Pulmonary artery, B. Bronchial artery, C. Vertebral artery, D. Posterior intercostal artery", 'role': 'user'}, {'content': 'Answer: A \nExplanation: It is Pseudo-aneurysmal dilatation of a branch of pulmonary artery adjacent to a tuberculous cavity.', 'role': 'assistant'}]