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: anne osborn krueger (; born february 12, 1934) is an american economist.

Answer: anne osborn krueger

Question: in 1920 the name was changed from fv to sv werder bremen.

Answer: werder bremen

Question: a video projector takes a video signal and projects the corresponding image on a screen using a lens system.

Answer:
video projector