Instructions: 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: Laura was feeling extremely thirsty. Sentence 2: All she had on her was some chocolate. Sentence 3: Laura then ran into her friend, Katherine. Sentence 4: Katherine held a bottle of water and was known to have a sweet tooth. Sentence 5: The two friends decided to trade their items. Choices: a. Coffee and tea. b. Trade.
Output:
b