You will be given a definition of a task first, then some input of the task.
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'.

Sentence 1: Pharmasset was a biotechnology company in New Jersey. Sentence 2: The company was working on drugs to treat viral infections. Sentence 3: One of their drugs had great promise to cure patients of hepatitis B. Sentence 4: A larger company, Gilead, bought Pharmasset for that drug. Sentence 5: Now Gilead sells billions of dollars of the drug every quarter. Choices: a. Hepatitis Success. b. Shoes.
Output:
a