Instructions: 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: Sara had a physics exam coming up. Sentence 2: Sara is always nervous about science and math testing. Sentence 3: Sara studied and studied all the physics material. Sentence 4: Sara made sure to get a good night's sleep before the day of the exam. Sentence 5: Sara nailed the physics exam! Choices: a. Exam. b. Zombie Dusk.
Output:
a