This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax And Mediastinum, Subject name: Surgery
Commonest cause of lung abscess: 
Select and explain. 
A. Aspiration, B. Hematogenous spread from distant site, C. Direct contact, D. Lymphatic spread
A: Aspiration
Answer: A: Aspiration 
Explanation: Lung Abscess Lung abscess refers to a microbial infection of the lung that results in necrosis of the pulmonary parenchyma MC cause of primary lung abscess: Anaerobic bacteria Etiology of anaerobic lung abscess: Aspiration