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.

[EX Q]: henan is a province of the people's republic of china.
[EX A]: henan

[EX Q]: jena malone (born november 21, 1984, sparks, nevada) is an american actress.
[EX A]: jena malone

[EX Q]: bivio is a former municipality in the district of albula in the canton of graubünden in switzerland.
[EX A]:
bivio