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:
ligny-sur-canche is a commune.
answer:
ligny-sur-canche


question:
bothnian bay (; ) is a bay in the northest of the gulf of bothnia.
answer:
bothnian bay


question:
oh se-hoon is a korean politician.
answer:

oh se-hoon