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.

Q: a sonata is a piece of music for one instrument or one instrument with another instrument accompanying.

A: sonata
****
Q: a rearguard is a part of a military force that protects the main force from attack from the rear.

A: rearguard
****
Q: cormaranche-en-bugey is a former commune.

A:
cormaranche-en-bugey
****
