Answer the following question given this paragraph: 

Bases are less common as foods, but they are nonetheless present in many household products. Many cleaners contain ammonia, a base. Sodium hydroxide is found in drain cleaner. Antacids , which combat excess stomach acid, are comprised of bases such as magnesium hydroxide or sodium hydrogen carbonate.


Q: What are antacids comprised of?

 Choices:

- gases

- solids

- acids

- bases

A:
bases
