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:
he wrote under the pen name d. h. lawrence.
answer:
d. h. lawrence


question:
real madrid castilla is a spanish football team.
answer:
real madrid castilla


question:
the crusades were a group of wars over religious views between the christian and muslim populations of europe.
answer:

crusades