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: jan mølby is a former football player.

Answer: jan mølby


Question: the thalamus is a symmetrical structure in the brains of vertebrates.

Answer: thalamus


Question: taipei metro is a metro system in taipei, taiwan.

Answer:
taipei metro