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.

click beetle is the common name for beetles in the family elateridae.
click beetle

henry's marriage to catherine of aragon was finally annulled in the following may by archbishop cranmer, thus ending the first of henry's 6 marriages.
catherine of aragon

green card or permanent resident card is an identification card that proves that someone who is not a united states citizen is a permanent resident of the united states.

green card