This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
Rasmussen's aneurysm occurs due to 
Select and explain. 
A. Veebral aery, B. Bronchial aery, C. pulmonary aery, D. Posterior intercostal aery
C: pulmonary aery
Answer: C: pulmonary aery 
Explanation: Rasmussen's aneurysm is a pulmonary aery aneurysm adjacent or within a tuberculous cavity. It occurs in up to 5% of patients with such lesions. It may lead to rupture and haemorrhage.