Detailed Instructions: 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.
Problem:Sentence1: Katie had to go for her annual doctor's appointment. Sentence2: She drove down to her doctors office. Sentence3: The doctor ordered a blood test. Sentence4: Her doctor called her with results. Sentence5: Katie was informed her cholesterol was high.
Solution:
Her doctor, Katie