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]: bradley-bourbonnais community high school (or bbchs) is a four-year public high school located in bradley, illinois, usa.
[EX A]: bradley-bourbonnais community high school

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

[EX Q]: he was the leader of two political parties: nick xenophon team federally, and nick xenophon's sa-best in south australia.
[EX A]:
nick xenophon