Pneumonia may be caused by an infection or injury of the lungs.
Legionnaires' disease is a type of pneumonia.
Legionnaires' disease may be caused by an infection or injury of the lungs.
What may be caused by an infection or injury of the lungs?
Options:
  * death and devastation
  * deadly and devastating
  * Legionnaires' disease
  * blood
  * smoking
  * a lot of human deaths
  * a tree falling
  * cigarettes