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:
a rearguard is a part of a military force that protects the main force from attack from the rear.
answer:
rearguard


question:
the arrondissement of auxerre is an arrondissement of france.
answer:
arrondissement of auxerre


question:
bud, not buddy is a children's novel written by christopher paul curtis.
answer:

bud, not buddy