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: Tom loved working on car engines. Sentence 2: He didn't care about looks. Sentence 3: Tom made his car incredibly fast. Sentence 4: He would take it to the track and race other cars. Sentence 5: They never expected him to beat them. Choices: a. Fast Car. b. Pregnancy Error.

a