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:
san diego creek is a small northwest-flowing river in orange county, california.
answer:
san diego creek


question:
"morning in america" is the common name of a political campaign television commercial.
answer:
morning in america


question:
arzo was a municipality of the district mendrisio in the canton of ticino in switzerland.
answer:

arzo