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: Noah had a frog pet he always kept in the bathroom. Sentence 2: One night, he invited his new girlfriend over. Sentence 3: When she excused herself to use the bathroom, she screamed. Sentence 4: Noah rushed to her aid and saw the frog sitting on the toilet. Sentence 5: He picked it up and introduced it to his girlfriend. Choices: a. Frog. b. Funny Bone.

a