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: Ken loved the mountains and exploring. Sentence 2: He liked going to old caves and looking for nice rocks. Sentence 3: He would often find gems or interesting crystals. Sentence 4: Ken loved collecting them. Sentence 5: Eventually he had two briefcases full of them. Choices: a. Bitter Beer. b. Looking for Gemstones.

b