Definition: In this task, you're given five sentences, numbered 1 through 5, and two options a and b for possible titles for the story. Your job is to choose the title that better fits the story. Indicate your choice by 'a' or 'b'.
Input: Sentence 1: Diana did not believe in vaccines. Sentence 2: She decided to not vaccinate her child. Sentence 3: Her child went to school. Sentence 4: Another child had the disease. Sentence 5: So her child got very sick. Choices: a. Happy. b. The small epidemic..

b