You are presented with the question "Pneumonia may be caused by an infection or what?" and the following answer choices: 
- smoke inhalation
 - Veins and arteries.
 - deadly and devastating
 - breathing deeply
 - clean air
 - expanding organs
 - the body's largest organ
 - Damages them

Now knowing that pneumonia may be caused by an infection or injury of the lungs and smoke inhalation and thermal lung injury cause direct lung injury, choose the best answer.


 

 smoke inhalation        