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: Tim was studying the history of America. Sentence 2: He learned about Native Americans. Sentence 3: He became fascinated with their culture. Sentence 4: He researched their historical sites. Sentence 5: He took a vacation to visit the sites and had fun. Choices: a. Andrea Always Accounted Aptly. b. Native Americans.
Output:
b