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: Mack was a large black lab puppy. Sentence 2: He slept in bed with me every night, but his gas was terrible. Sentence 3: One night, his gas was so atrocious that I moved to the couch to sleep. Sentence 4: I could smell it all the way into the living room. Sentence 5: Eventually he joined me on the couch. Choices: a. Eye Appointment. b. Mack's Flack.

b