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:
the gandaki river is one of the major rivers of nepal.
answer:
gandaki river


question:
a hamburger is a type of sandwich with cooked ground meat between the two halves of a bun.
answer:
hamburger


question:
mani ratnam (born june 2, 1956) is a tamil indian movie director, writer and producer.
answer:

mani ratnam