You will be given a definition of a task first, then some input of the task.
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'.

Sentence 1: Nate fell down and scraped his knee really bad. Sentence 2: His mother cleaned up the knee and put a band aid on it. Sentence 3: Nate went back outside to play and took off the band aid. Sentence 4: When his mother noticed she asked Nate why he took his band aid off. Sentence 5: Nate told his mom it made him look tough. Choices: a. No Band-Aid. b. Sunrise..
Output:
a