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: Hank organized a pool party for his neighborhood. Sentence 2: He invited everyone on the block. Sentence 3: One of his invitations got lost by the mail. Sentence 4: That neighbor assumed that Hank did not invite her. Sentence 5: She held a grudge against him from then on. Choices: a. Pool Party. b. Poison Ivy.

a