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: Some friends and I went trekking through the woods. Sentence 2: We were searching for a mountain pool. Sentence 3: When we finally found it we had to dare each other to get in. Sentence 4: The water was freezing cold! Sentence 5: I could only get my legs in but it was a fun journey. Choices: a. Lost in the museum. b. Mountain pool.

b