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: Kia's class was doing a unit on Israel. Sentence 2: Each student got a pen pal from Israel. Sentence 3: Kia's was named Ana and they became great friends. Sentence 4: When the unit ended, most students stopped writing. Sentence 5: But Kia and Ana remained pen pals for years! Choices: a. Gold. b. Pals.

b