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: One night, I brushed my teeth before going to bed. Sentence 2: But while brushing, I felt a sore in my mouth. Sentence 3: I brushed more slowly to avoid being hurt. Sentence 4: When I was done, I rinsed my mouth. Sentence 5: The next day, I called the dentist so he could look at the sore. Choices: a. Dental pain. b. Bill goes shopping.

a