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: I thought I could go without caffeine to wake me up. Sentence 2: I sat at my desk, trying to concentrate. Sentence 3: I felt foggy headed and unfocused. Sentence 4: I gave up and got a diet mountain dew. Sentence 5: I drank the entire can before I felt better. Choices: a. The Glasses. b. Caffeine.

b