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: Jim was trying to eat cereal. Sentence 2: He poured it all out before checking the milk. Sentence 3: When he tried pouring out the milk it was chunky. Sentence 4: The smell nearly made Jim gag. Sentence 5: He had to throw out the remaining milk and cereal. Choices: a. Old Milk. b. Overweight Cat.
a