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: Yas and her sister Jaz are twins. Sentence 2: They used to be very hard to tell apart. Sentence 3: Yas decided to bleach her black hair to white blonde. Sentence 4: She didn't read the directions, though, and all of her hair fell out. Sentence 5: Now that one sister is bald, they're very easy to tell apart. Choices: a. Can't be safe. b. Twins.

b