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 nepal bhasa wikipedia is the nepal bhasa-language edition of wikipedia.
[A]: nepal bhasa wikipedia


[Q]: causality is a way to describe how different events relate to one another.
[A]: causality


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