Given the task definition and input, reply with output. 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: Tyson had gotten bitten by a bug. Sentence 2: The bite itched. Sentence 3: Tyson scratched and picked at the bite. Sentence 4: The bite became infected. Sentence 5: Tyson had to go to the doctor to cure the infection. Choices: a. A Bad Bite. b. Sale.
a