You will be given a definition of a task first, then some input of the task.
In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Population inversion is achieved in diatomic nitrogen and in this molecule in order to produce infrared light in the most commonly used form of laser industrially. In the body, a certain ""anhydrase"" enzyme converts this molecule into an anion. The bond angles of this molecule are 180 degrees, thus making it the textbook example of a molecule with linear geometry. At atmospheric pressure, it does not form a liquid, instead undergoing deposition from its normal form into dry ice. For 20 points, identify this greenhouse gas.
Output:
Science