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: Henry's phone charger broke in the library. Sentence 2: He tried to save his battery throughout the entire day. Sentence 3: However, it died. Sentence 4: The bookstore clerk offered $20 for a new charger. Sentence 5: Although it was expensive to him, Henry bought it. Choices: a. Expensive but Necessary. b. Surprise Dish.

a