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: Luke was twelve years old when he started feeling changes. Sentence 2: He didn't understand why he was growing hair in strange places. Sentence 3: He was almost embarrassed with the way he felt towards girls. Sentence 4: He thought he was sick. Sentence 5: His dad told him it was just part of life and he went through it too. Choices: a. Busted Phone. b. Puberty.

b