In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.
Q: Sentence1: Dan was playing football without his arm guards. Sentence2: When the quarterback passed the ball to him, he ran. Sentence3: The linebacker on the opposing team tackled him. Sentence4: Dan landed on his arm, breaking it. Sentence5: His parents took him to the hospital.
A:
Parents, Dan, The quarterback, Linebacker