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: Tom wanted to buy a new towel. Sentence 2: Tom went shopping at the store. Sentence 3: He browsed and found many types of towels. Sentence 4: He found the micro-fiber towels to be the softest. Sentence 5: Tom bought microfiber towels. Choices: a. Stomach Virus. b. Towels.

b