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: The baby ate a lot of milk. Sentence 2: She didn't feel too good. Sentence 3: Her stomach was really full. Sentence 4: The milk came back up. Sentence 5: She spit-up on her mom's clothes! Choices: a. Book report. b. Baby Spit-up.

b