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: Tim walked to the starting line of the race. Sentence 2: His heart was pounding and the gun went off. Sentence 3: After a mile, he began to fall back. Sentence 4: His coach encouraged him from the sidelines. Sentence 5: Ultimately, Tim won the race. Choices: a. Race Day. b. No Helmet.

a