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.

It is mainly obtained in the form of impurities in sulphide ores, which can be roasted to create an oxide which is then reduced to yield the metallic form, and from the minerals realgar and orpiment. It is used in lead-based alloys to produce hardening, and its compounds are used as doping agents in semiconductors and in insecticides, while several complex organic compounds containing it are employed in the treatment of certain diseases, such as amebic dysentery, caused by microorganisms. FTP, name this element, which may have been first isolated around 1250 by Albertus Magnus, a metalloid of group V with atomic number 33 and symbol As.
Science