Definition: 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.
Input: A ligand containing it as its central atom dissociates from rhodium(I) ["rhodium-one"] in the catalytic mechanism of Wilkinson's catalyst. It is found in a four-membered ring with sulfur in Lawesson's reagent, and this element nucleophilically attacks nitrogen in the Staudinger reaction and the Mitsunobu reaction. It was discovered in 1669 by German alchemist Hennig Brand where is was prepared through a sample of his own urine. Existing as both red and white allotropes, FTP, identify this nonmetallic element that is found below nitrogen as element number 15 on the periodic table.
Output:
Science