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:
songkran is a festival held every year in thailand on april 13.
answer:
songkran


question:
the cyclostomes (or cyclostomata) are the lamprey and hagfish.
answer:
cyclostome


question:
a catalytic converter is a device in the exhaust pipe of a car, near its engine.
answer:

catalytic converter