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 black powder rocket motor pushes a model rocket using black powder.

A: black powder rocket motor
****
Q: orvon grover autry (september 29, 1907 – october 2, 1998), better known as gene autry was an american movie actor and a singer.

A: gene autry
****
Q: san pedro de la paz is a commune and city in chile.

A:
san pedro de la paz
****