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: George went to the gym every day to lift weights. Sentence 2: The stronger he got, the more and more he cared about his gains. Sentence 3: One day, his mother became worried that he spent too much time there. Sentence 4: However, George assured her that what he was doing was healthy. Sentence 5: His mother still cared, but felt better when he said that. Choices: a. Lifting. b. Ollie's Dog.

a