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: Roger and Rufus were taking an important exam. Sentence 2: It was almost time and Rufus was not there. Sentence 3: Roger called him frantically, and asked him where he was. Sentence 4: Rufus responded that he overslept and just woke up. Sentence 5: Roger then heard Rufus laugh from the other end of the hallway. Choices: a. Friend Late for Exam. b. New Dog.

a