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 viola is a musical instrument which is similar to the violin and cello.
answer:
viola


question:
dennis kearney (1847–1907) was an american politician who was himself an immigrant from ireland.
answer:
dennis kearney


question:
the international date line (idl), also known as just the date line, is an imaginary line on the surface of the earth, going from north to south in the pacific ocean.
answer:

international date line