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: My 99 year old friend Ben is losing his memory. Sentence 2: He cannot remember what he did last night. Sentence 3: Everyday he asks me if I have children, and I tell him. Sentence 4: Yesterday he asked him how my two kids were doing. Sentence 5: I was surprised, and pleased. Choices: a. The trip. b. Short Term Memory.

b