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: Flanders parked his Recreational Vehicle on the street. Sentence 2: His niece asked if she could live in it. Sentence 3: Flanders gave her niece the key. Sentence 4: The police noticed lights on in the vehicle. Sentence 5: They warned Flanders about a possible intruder. Choices: a. Clean Microscope. b. Intruder.

b