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.

area code 701 is an area code for the u.s. state of north dakota.
area code 701

rakesh sharma (born 13 january 1949) is a retired squadron leader in the indian air force.
rakesh sharma

eureka tower is a 300 metre (984 foot) tall skyscraper in melbourne, australia and is the tallest building in australia when measured to its roof.
eureka tower