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: The class was ready for their field trip. Sentence 2: They loaded up on the bus and took off. Sentence 3: They arrived at a local cave. Sentence 4: The class spent that day looking at all the cave formations. Sentence 5: The field trip was fun and informative. Choices: a. Shark Teeth. b. The Cave.
Output:
b