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: michelbach-le-bas is a commune.

Answer: michelbach-le-bas


Question: cerebral œdema (or cerebral edema) is a build-up of extra fluid in the brain.

Answer: cerebral edema


Question: san nicolas island is the most farthest from shore of california's channel islands.

Answer:
san nicolas island