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.

Q: a brinicle is a column of ice that forms in seawater.

A: brinicle
****
Q: valbirse is a new municipality of the administrative district of jura bernois in the canton of berne in switzerland.

A: valbirse
****
Q: thomas jefferson national accelerator facility (tjnaf), commonly called jefferson lab or jlab, is a u.s. national laboratory in newport news, virginia.

A:
thomas jefferson national accelerator facility
****