Given the task definition and input, reply with output. 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'.

Sentence 1: After mom left today, dad sat us down to have a talk. Sentence 2: He said he thinks mom has a shopping problem and we need to help her. Sentence 3: I argued against him, saying she was just enjoying herself. Sentence 4: It got pretty heated, but then mom pulled up. Sentence 5: She had four crates of condensed milk in her back seat. Choices: a. Gemstones. b. Mom's Got A Problem.
b