Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: Ahhhh! A tall glass of ice-cold lemonade is really refreshing on a hot day. Lemonade is a combination of lemon juice, water, and sugar. Do you know what kind of matter lemonade is? It's obviously not an element because it consists of more than one substance. Is it a compound? Not all combined substances are compounds. Someincluding lemonadeare mixtures. Answer: mixtures
Combined substances are either compounds or what?