[NTG-context] Random selection of a word in a set with lua and mkiv

Hi all, Assuming that we have a set of words or expressions, say {Maths, Physics, Algebra, Analysis, Chemistry, Geometry, Wave equation, Schrödinger equation} is it possible to write a lua function, named for instance randomselectword which returns one of the words or expressions selected at random in the above set? Indeed this is intended to be used in a TeX file processed with mkiv. Thanks in advance for any idea and help. Best regards: OK