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]: rudolf kargus (born 15 august, 1952) is a former german football player.
[A]: rudolf kargus


[Q]: the 1939–40 nhl season was the 23rd season for the national hockey league.
[A]: 1939–40 nhl season


[Q]: tony martin (born alvin morris, december 25, 1913 – july 27, 2012) was an american actor and singer who was married to performer cyd charisse for 60 years.
[A]:
tony martin