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.

Ex Input:
This reaction is combined with an aldol condensation to produce cyclohexenones in a process named for Robinson, and a variation of this uses silyl ethers and titanium tetrachloride, in a reaction named also for Mukaiyama. In a process analogous to this reaction, performed with simple ketones, the equilbrium is shifted towards the reagents, unlike in the Claisen and aldol condensations, necessitating the use of an enolate in conjugate addition to produce the 1,4-addition. For 10 points, what is this reaction named for an American chemist, which consists of the addition of a carbanion to an alpha, beta unsaturated carbonyl

Ex Output:
Science


Ex Input:
When these devices exploit their voltage-dependent variable capacitance they are known as varactors. Barring the creation of local hot spots, a non-destructive avalanche current is produced by electron-hole pair propagation when the electric field within the (*) depletion region of these devices reaches a critical value. Majority carriers exist in an energy state greater than the Fermi energy in the Schottky barrier variety and those that operate in reverse breakdown are named after Zener. For 10 pointsname these devices that allow current to pass in only one direction.

Ex Output:
Science


Ex Input:
Palladium is commonly used as one of these species in most organic coupling reactions. A mixture of titanium and aluminum forms the Ziegler-Natta one used in polymerization reactions. In cars, platinum is used as one to convert carbon monoxide to carbon dioxide. Chlorofluorocarbons act as one in the breakdown of ozone in the atmosphere. These species work by lowering the activation energy of a chemical reaction, and a common industrial one is iron in the Haber-Bosch process. For 10 points, name these chemical species which speed up a reaction.

Ex Output:

Science