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]: colonel archibald gracie iv (january 17, 1859 – december 4, 1912) was an american writer, amateur historian, real estate investor, and survivor of the sinking of the r.m.s titanic.
[EX A]: archibald gracie iv

[EX Q]: aaron downey (born august 27, 1974 in shelburne, ontario) is a canadian retired professional ice hockey right winger that played 10 seasons in national hockey league.
[EX A]: aaron downey

[EX Q]: an air raid is an attack in which bombs are dropped from aircraft on to a ground or sea target.
[EX A]:
air raid