Fact 1: Cartilage is a tough tissue that contains a protein called collagen. Fact 2: Acid helps dissolve collagen. Given the two facts above, what can acid help dissolve?

OPTIONS: [I] drink [II] layers of fat [III] an object [IV] a solute [V] cartilage [VI] Sediment [VII] Bodily water [VIII] roots
The answer is:
[V]