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: Mick and his cat Chester had been together for 19 years. Sentence 2: Chester was mostly a house cat but he had gotten sick one day. Sentence 3: Noticing that Chester was getting worse, Mick took Chester to the vet. Sentence 4: But the veterinarian had to put the cat to sleep to end his suffering. Sentence 5: Mick never adopted another cat after Chester. Choices: a. Goodbye Chester.. b. Putting Up Shelves.

a