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: Tom worked hard on his costume. Sentence 2: It was an obscure reference. Sentence 3: He hoped people would get it. Sentence 4: Unfortunately nobody ever did. Sentence 5: Tom was disappointed and sad. Choices: a. Obscure Costume. b. Laundry Day.

a