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 hated dirty sponges. Sentence 2: He was annoyed when his roommates wouldn't squeeze one out. Sentence 3: It made them get moldy and smell bad. Sentence 4: Tim kept throwing them out. Sentence 5: His roommates eventually stopped being as careless. Choices: a. Gross Sponge. b. Pigeons.
Output:
a