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: the capital of hunedoara county is deva.

A: hunedoara county
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Q: a releaser is a stimulus from one animal to another, which causes a particular response.

A: releaser
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Q: the sievert, abbreviated "sv" is the si unit to measure the equivalent dose of ionizing radiation.

A:
sievert
****