system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
What is a quark?


assistant
A quark are elementary particles that make up a class of matter called hadrons, the most common of which are protons and neutrons.  According to the Standard Model of elementary particle physics there are six types of quarks which come in pairs or families;  Up/Down, Strange/Charm, and Bottom/Top.