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.

Q: the moirai(the fates) were the three goddesses of destiny in greek mythology.

A: moirai
****
Q: causality is a way to describe how different events relate to one another.

A: causality
****
Q: the exorcism of emily rose is a horror-drama movie of 2005.

A:
the exorcism of emily rose
****