In case of pneumothorax -
Ans. is 'b' i.e., Air fills in pleural space * Pneumothorax- Air in pleural cavity* Empyema- Pus in pleural cavity* Hemothorax- Blood in pleural space* Hydrothorax- Fluid in pleural cavity
Cavity in lung
Air fills in pleural space
Pus fills in pleural space
Blood in pleural space
Lung