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 was at his prom. Sentence 2: Someone spiked one of the punch bowls. Sentence 3: The students kept drinking out of that specific one. Sentence 4: It was refilled often to not make it obvious. Sentence 5: Tom and his friend's got drunk. Choices: a. Spiked Punch. b. Thunder Storm.

a