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: Harry wanted to own a cat. Sentence 2: And he finally got one for his birthday. Sentence 3: But taking care of it was more work than he realized. Sentence 4: And after a week, he became more and more frustrated. Sentence 5: So Harry decided to give his cat away. Choices: a. Collapse. b. Responsibility.

b