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: Tom felt ill. Sentence 2: He went to see the doctor. Sentence 3: The doctor told him he had cancer. Sentence 4: Tom received chemotherapy to treat the cancer. Sentence 5: The treatment was a success. Choices: a. The Sale. b. Cancer.

b