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.

A genetic defect in their synthesis is implicated in Zellweger syndrome, where the body is unable to oxidize certain long-chain fatty acids. Though proteins are not thought to use the endoplasmic reticulum to reach it, new evidence suggests it may have evolved from proteins related to that organelle, casting doubts on its supposed endosymbiontic origin. Key to production of the myelin sheath, it also plays a role in bile production as well as primarily breaking down ethanol into acetaldehyde and using enzymes such a catalase to deal with toxic waste products. For 10 points, name this cellular organelle, a major produce of hydrogen peroxide.
Science