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: Anna got a mosquito bite. Sentence 2: She scratched it a lot. Sentence 3: It got infected! Sentence 4: Her mom had to take her to a doctor. Sentence 5: There, Anna was given antibiotics. Choices: a. Bite. b. Building Time.

a