TASK DEFINITION: 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.
PROBLEM: the gandaki river is one of the major rivers of nepal.

SOLUTION: gandaki river

PROBLEM: aerospace engineering is a field of engineering that specializes in vehicles that move in fluids.

SOLUTION: aerospace engineering

PROBLEM: the mitsubishi carisma is an automobile produced by mitsubishi motors between 1995 and 2004 with a facelift in 1999.

SOLUTION:
mitsubishi carisma