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: Penny lost her hairbrush. Sentence 2: She looked everywhere in her apartment. Sentence 3: She looked in her purse. Sentence 4: When she couldn't find it, she knocked on her neighbor's door. Sentence 5: She borrowed her hairbrush and was very thankful. Choices: a. Trading Cards. b. Lost hairbrush.

b