From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Q: Given Relationship: 'be cause of', Sentence: 'The founder of Alive and Well Los Angeles has been on many TV shows promoting the fact that HIV is not the cause of AIDS .'

A: cause
****
Q: Given Relationship: 'be key to', Sentence: 'As present processes are thought to explain all past events , the Uniformitarianism slogan is " the present is the key to the past . "'

A: key
****
Q: Given Relationship: 'be son of', Sentence: 'The Bannister you have listed is a descendant of Joseph through his son , Henry Royster , and Henry 's son , James Wilkins Royster who married Mary Wells .'

A:
son
****