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: Susan rented a stall for her horse. Sentence 2: The owner of the stall fed the horse some cheese. Sentence 3: The horse got sick from the cheese. Sentence 4: Susan confronted the stall owner. Sentence 5: The stall owner gave Susan a refund for one month. Choices: a. Malpractice. b. Horse Stall.

b