Definition: In this task, you're given five sentences, numbered 1 through 5. Your job is to generate a title for the story that makes complete sense. The title must be short, with less than three words, use simple language, and include the main topic of the story.
Input: Sentence 1: Guilherme was studying marine biology in school. Sentence 2: He didn't know how to swim. Sentence 3: His teacher told him it was vital to know how to swim in this job. Sentence 4: Guilherme went to the local pool and jumped in. Sentence 5: He sank straight to the bottom.

Marine Biology