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.
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Question: plankton are drifting organisms that live in the surface layers of the ocean.

Answer: plankton


Question: his life was featured in a 1992 tv movie, "final shot: the hank gathers story" and in an espn film called "guru of go" for their 30 for 30 sries.

Answer: hank gathers


Question: giovanni silva de oliveira (born 4 february, 1972) is a former brazilian football player.

Answer:
giovanni silva de oliveira