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: John is driving down the road. Sentence 2: He begins to smell smoke from his car. Sentence 3: He pulls over to check it out. Sentence 4: His engine is blown up. Sentence 5: He has to call a tow truck to tow him back to town. Choices: a. John breaks down. b. Cat.

a