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: Ed liked to pretend he was a robot. Sentence 2: He went to school like that also. Sentence 3: Some kids started picking on him because of his robot ways. Sentence 4: He gave one of them a black eye and another an arm twist. Sentence 5: They didn't know this robot knew karate. Choices: a. Lightbulb. b. Robot.

b