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.
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Question: Sentence1: Don was four years old. Sentence2: He wanted to ride in a baby stroller. Sentence3: He could no longer fit in the stroller. Sentence4: This made him angry. Sentence5: He cried because he does not want to keep growing.

Answer: Don

Question: Sentence1: Barry took a science class. Sentence2: He didn't expect an essay. Sentence3: He took a test with one. Sentence4: He did his very best. Sentence5: Barry didn't do so well.

Answer: Barry, Science class

Question: Sentence1: Tom wanted to attend medical school. Sentence2: Tom did not earn a scholarship and could not afford it. Sentence3: Tom's friend suggested he attend free medical school in Cuba. Sentence4: Tom attended the free medical school in Cuba. Sentence5: Tom eventually became a doctor.

Answer:
Tom's friend, Tom