Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

zirconium is a chemical elemental metal.
zirconium

querfurt a town in saalekreis district (kreis) in the south of saxony-anhalt, germany, in a fertile country on the querne, 29 km west from merseburg, on a branch line from oberroblingen.
querfurt

arleux-en-gohelle is a commune.

arleux-en-gohelle