You will be given a definition of a task first, then some input of the task.
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'.

Sentence 1: Tim took his son to the fair. Sentence 2: They were trying to hit bottles to win a toy. Sentence 3: His son hit three different bottles. Sentence 4: So he got to choose his toy. Sentence 5: He choose a dog. Choices: a. Winning a toy. b. No gift back.
Output:
a