You are presented with the question "What can make lungs more at risk for infection by streptococcus?" and the following answer choices: 
- Allergies
 - bacteria
 - Pollution
 - injury
 - fungi
 - sweating
 - the skin
 - smoking

Now knowing that pneumonia may be caused by an infection or injury of the lungs and streptococcal pneumonia is caused by the bacteria Streptococcus pneumoniae, choose the best answer.


 

    injury     