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.

mariner 10 was a robotic nasa space probe.
mariner 10

tactopods are members of a proposed clade of ecdysozoans called tactopoda.
tactopoda

when the baoruco province was created in 1943, it was formed with the municipalities neiba, duvergé, la descubierta and tamayo.

baoruco province