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.

maicon douglas sisenando (born 26 july 1981) is a brazilian football player.
maicon douglas sisenando

a marriage proposal is when one person in a relationship asks the other person to marry them.
marriage proposal

the grey partridge ("perdix perdix") is a 30 cm tall bird.

grey partridge