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
Hyperanslucency of lung unilaterally is seen on all except : 
Select and explain. 
A. Pneumothorax, B. Resection of mammary gland, C. Pulm a. obstruction, D. Pneumonectomy
D: Pneumonectomy
Answer: D: Pneumonectomy 
Explanation: D i.e. Pneumonectomy Pulmonary agenesisQ & PneumonectomyQ are the causes of radiopaque lung with I/L mediastinal shiftQ. Pulmonary aery obstruction (i.e. Pulmonary embolism) l/t radiolucent lungQ.