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: Surgery
Complication of empyema are A/E - 
Select and explain. 
A. Empyema necessitans, B. Bronchopleural fistula, C. Osteomyelitis, D. Pneumonia
D: Pneumonia
Answer: D: Pneumonia 
Explanation: Answer is 'd' i.e. Pneumonia Penumonia is the most common cause of empyema and not a complication Complications of Empyema Empyema necessitans (spontaneous decompression of pus through the chest wall) Chronic empyema (with entrapped lung and pulmonary restrictive ds) Osteomyelitis or chondritis of the ribs or veebrae Pericarditis Mediastinitis Bronchopleural fistula Dissseminated inf. of the central nervous system