You need to answer a given question containing a blank (_). Your answer must be one of the two objects mentioned in the question, for example "trophy" and "suitcase". Your answer must not contain a word that is not present in the question. Please don't use articles (e.g., the, a) before the answer.

I was listening to some music while swimming with my phone and headphone but the headphone later stopped working. The _ is waterproof.
phone

The food in the bowl could not be eaten by anyone and we decided to go for the milk. The _ is fresh.
milk

He improvised on the piano more often than his guitar when writing new music because he learned to play the _ only recently.

guitar