instruction:
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.
question:
dakota johnson (born october 4, 1989 in austin, texas) is an american actress and model.
answer:
dakota johnson


question:
defibrillation is the act of defibrillating the heart to treat the heart when it is not pushing blood because the heart muscle is not working in any pattern.
answer:
defibrillation


question:
the scrotum is the bag that holds the testicles (commonly called "balls") in male mammals.
answer:

scrotum