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: One of the laboratories caught on fire. Sentence 2: The teaching assistant pressed the fire alarm. Sentence 3: Everyone in the building came out. Sentence 4: The fire wasn't clear until 10 minutes later. Sentence 5: Since the laboratory was destroyed, the teacher cancelled the class. Choices: a. Evacuation. b. Camp.

a