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: John always wanted to learn how to fly a plane. Sentence 2: He ended up joining his uncles flight school. Sentence 3: He ended up flying a plane with his uncle after one month of training. Sentence 4: He had his first solo flight a month after his flight with his uncle. Sentence 5: He was awarded with his pilot's license a month later. Choices: a. John's Pilot Test. b. Litter box.

a