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: Jackson decides to watch a professional baseball game. Sentence2: During the game he begins to feel hungry. Sentence3: He eats a hotdog and drinks a beer. Sentence4: After eating he feels too sleepy to watch the game. Sentence5: He goes home to nap before the game is half over.
[A]: Jackson

[Q]: Sentence1: Fred was a worker on his uncle's dock at the pier. Sentence2: He would work everyday cleaning, and catching fish. Sentence3: One day, he noticed a rather large fish in his nets. Sentence4: When he looked a second time, he realized the fish was a dolphin. Sentence5: Fred worked quickly to free the fish from the nets and release him.
[A]: Uncle, Dolphin, Fred

[Q]: Sentence1: Tom could no longer see out of his spectacles. Sentence2: He went to the optometrist. Sentence3: The eye doctor ran many tests. Sentence4: He issued Tom a new prescription and glasses. Sentence5: Tom left with the new glasses.
[A]:
Optometrist, The optometrist