Given the task definition and input, reply with output. 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: I used to work at an animal hospital. Sentence 2: Some dogs had to stay over night. Sentence 3: At night, I would play with the dogs so they didn't get lonely. Sentence 4: One night, I thought I lost one in the facility. Sentence 5: The next moment I turn my head and see a big ball of fluff in my face! Choices: a. The Game. b. Thanksgiving dinner.
a