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: Shane always drank his coffee with milk and two sugars. Sentence 2: He went to the same coffee shop for ten years. Sentence 3: One day he got really sick after drinking his coffee. Sentence 4: He wasn't lactose intolerant or anything. Sentence 5: The coffee shop forgot to put new milk out that and it went sour. Choices: a. The Girl. b. Sour Milk.

b