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: Marvin loved to study astronomy. Sentence 2: His dad got him a telescope for his birthday. Sentence 3: He looked at the stars every night. Sentence 4: One day he discovered a comet. Sentence 5: He named it after his Dad. Choices: a. Dad's Comet. b. Laughing at Pain.

a