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]: the 1st millennium bc was the last millennium before the common era.
[A]: 1st millennium bc


[Q]: chiayi city (; taiwanese: ka-gī chhī) is a provincial city of southwestern taiwan province of the republic of china.
[A]: chiayi city


[Q]: monteceneri is a municipality of the district lugano in the canton of ticino in switzerland.
[A]:
monteceneri