You are presented with the question "what can acid help dissolve?" and the following answer choices: 
- drink
 - layers of fat
 - an object
 - a solute
 - cartilage
 - Sediment
 - Bodily water
 - roots

Now knowing that cartilage is a tough tissue that contains a protein called collagen and acid helps dissolve collagen, choose the best answer.


 

     cartilage    