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: Zack always walked home from school. Sentence 2: And he carried pepper spray with him. Sentence 3: One day, a pit bull approached him. Sentence 4: And he quickly used his pepper spray. Sentence 5: After the pit bull ran away, Zack was glad he had pepper spray. Choices: a. Pepper Spray. b. Tony Needs to Clean.

a