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: Greg picked up the van. Sentence 2: He took it to it's scheduled maintenance. Sentence 3: The mechanic found some additional problems with the van. Sentence 4: Greg called his boss. Sentence 5: His bock picked him up from the mechanics. Choices: a. Phone for pokemon. b. Van.

b