Given the task definition and input, reply with output. 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.

This element is reacted with a diiodomethane to create a cyclopropane ring on a carbon-carbon double bond in the Simmons-Smith Reaction. Supplements of this element are often given to prevent Wilson's disease, since it stimulates production of metallothionein. The French and American processes can be used to produce an important oxide of this element, now being used in transparent LCDs. This element is used in combination with a hydroxylic solvent and a strong acid like HCl in order to produce an alkane from an aldehyde or ketone in the Clemmensen reduction. Gag knuckles and treble clefs are types of structures named for this element that stabilize protein folds, and its most common ore is called sphalerite. For 10 points, name this element which can be found in namesake "fingers", and which forms brass when combined with copper.
Science