Here's a short story:

One day, a boy named Jack wanted take a trip on his red tricycle. He was not sure where he wanted to go, but he knew he wanted to go somewhere far away. It was a cloudy and chilly day, so Jack wore a warm shirt. Jack worried that he might get lonely on his trip. He borrowed his mother's phone and taped it to the handle bars of his tricycle so he could call home. He also put his music player in his pocket. Jack put some left over pizza in his backpack in case he got hungry. Jack pedaled down his driveway, heading out on his big trip. When he got to the end of his driveway, Mrs. Jones, his teacher from school, was walking by on the sidewalk. "Hello Jack", said Mrs. Jones, "Where are you going on that nice red tricycle?" "I'm going on a trip to someplace far away" said Jack. Mrs. Jones smiled, and thought for a second. "Make sure you are back by morning, we have a field trip tomorrow", said Mrs. Jones. Jack had been waiting for the field trip for weeks. He looked at Mrs. Jones and said, "I think I'll wait to take a trip until I can fly. I don't want to miss the field trip and this tricycle is not very fast." (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: What color was Jack's tricycle?
Guess: red

Question: What type of shirt did Jack wear?
Guess: a warm shirt

Question: What worried him about his trip?
Guess: he might be lonely

Question: What did he borrow from his mother?
Guess: a phone

Question: What did he do with it?
Guess: taped it to the handle bars of his tricycle

Now answer the following question in the same format.

Question: What did he put in his pocket?

a music player