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: Arnold's head hurt really bad. Sentence 2: He went to look for some pain killers. Sentence 3: Arnold looked in the bathroom cabinet. Sentence 4: He found a small bottle of painkillers. Sentence 5: Arnold took two painkillers with a glass of water. Choices: a. Pepper the Dog. b. headache.

b