Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.

Sentence: 'Q : I am looking for the version of UB40 's Cant Help Falling In Love that is played in the music video .', Argument/Subject 1: 'cant', Argument/Subject 2: 'fall'
help

Sentence: 'Ever since Columbus discovered the Americas at the end of the 15th Century , the region was known as The New World .', Argument/Subject 1: 'columbus', Argument/Subject 2: 'america'
discover

Sentence: 'If HIV were not the cause of AIDS , the new antiretroviral " cocktails " would not work and CKR5 , a key receptor for HIV infection , would not delay the onset of AIDS .', Argument/Subject 1: 'aid', Argument/Subject 2: 'hiv'
be cause by