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: Spencer and Perry had a son together. Sentence 2: As the son grew older Spencer began to wonder if the child was his. Sentence 3: He secretly took the child to a lab for a DNA test. Sentence 4: Perry had no idea and thought they went to the movies. Sentence 5: The DNA test result showed that Spencer was not the biological father. Choices: a. Chess. b. You are not the father.
Output:
b