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: My niece used to play with me in roughhouse fashion. Sentence 2: One day she ran up to hit me. Sentence 3: She was seven. Sentence 4: I put my arm up and she lost her baby tooth. Sentence 5: Her father laughed at her. Choices: a. Lost Tooth. b. Early Dismissal.

a