Sodium chloride : Common salt :: Calcium oxide : ? Which term completes the analogy?

The relation is the chemical name of a substance : the everyday name the same substance goes by in a shop or a building yard. Sodium chloride is common salt; calcium oxide is quicklime, the white lump that hisses and grows hot when water is poured over it. Each distractor is the everyday name of a different compound, which is the trap — baking soda is sodium bicarbonate, washing soda is sodium carbonate and chalk is calcium carbonate, which is what quicklime is burnt from rather than quicklime itself.