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: fukuoka airport (福岡空港, fukuoka kūkō) , formerly known as itazuke air base, is a japanese airport in fukuoka.

A: fukuoka airport
****
Q: tuff (from italian "tufo") is a type of rock produced by the eruption of volcanoes.

A: tuff
****
Q: myopathy is a disease of the muscle in which the muscle fibers do not function properly.

A:
myopathy
****