Detailed Instructions: 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'.
Q: Sentence 1: I went my whole life without ever having a cavity. Sentence 2: One day I felt the worst pain in my jaw. Sentence 3: I made a dentist appointment immediately. Sentence 4: He told me I need a root canal on a the tooth that hurt. Sentence 5: I also had eight other cavities he needed to fill. Choices: a. Cavities. b. The bad roommate.
A:
a