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.

In some cases, zeolites act as a type of these that present molecules at the interface between an aqueous solution and an organic solution. Quaternary ammonium salts are often used as a type of these that help anionic samples dissolve in organic solvents. These compounds, which come in (+) "phase- boundary" and "phase-transfer" varieties, include a heterocyclic carbene bound to a central ruthenium atom in the kind named for (*) Grubbs. Palladium poisoned with lead salts composes the one named for Lindlar. These compounds function by lowering activation energy. Biological examples of these compounds are called enzymes. For 10 points, name these compounds that increase the rate of a reaction.
Output:
Science