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: Mary really loved rock music. Sentence 2: She finally went to see her favorite band. Sentence 3: Mary joined the mosh pit. Sentence 4: A guy ran into Mary and broke her rib. Sentence 5: Mary no longer goes to concerts. Choices: a. The Concert. b. Bestseller.

a