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.

ronald ross (13 may 1857 – 16 september 1932) was an english doctor.
ronald ross

rudolf kargus (born 15 august, 1952) is a former german football player.
rudolf kargus

the philadelphia inquirer is a newspaper that serves the philadelphia, pennsylvania, metropolitan area of the united states.

the philadelphia inquirer