Answer the following question given this paragraph: 

A: The main ingredient of mothballs is the hydrocarbon naphthalene. The main ingredient in nail polish remover is the hydrocarbon acetone. The lawn mower runs on a mixture of hydrocarbons called gasoline, and the camp stove burns a hydrocarbon fuel named isobutane.


Q: What is the main ingredient of mothballs?


A:
hydrocarbon naphthalene