instruction:
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.
question:
the river clyde (, ]) is a river in scotland.
answer:
river clyde


question:
the temple of athena nike is a temple on the acropolis of athens.
answer:
temple of athena nike


question:
mainz is a german city.
answer:

mainz