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: Carlo wanted to go to the circus. Sentence 2: The circus announced a new attraction. Sentence 3: It was about a real live unicorn. Sentence 4: When Carlo got there he was very excited. Sentence 5: The unicorn was a goat with a single horn. Choices: a. Circus. b. Laughter.

a