You are presented with the question "What has a negative impact on the sinuses?" and the following answer choices: 
- A virus
 - viruses
 - an object
 - carbon dioxide
 - air
 - mold spores
 - disease
 - oxygen

Now knowing that amold spore has a negative impact on the respiratory system and sinusitis Sinuses are a part of the upper respiratory system, choose the best answer.


 

      mold spores   