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.

Q: Sentence: 'Yin and yang are always opposite , with yin being sweet , cold , and passive and with yang being salty , hot , and aggressive .', Argument/Subject 1: 'yang', Argument/Subject 2: 'yin'

A: be opposite of
****
Q: Sentence: 'Anteros is the twin brother of Eros .', Argument/Subject 1: 'antero', Argument/Subject 2: 'ero'

A: be brother of
****
Q: Sentence: 'Amethyst is February 's birthstone , and an attractive gemstone for any season .', Argument/Subject 1: 'amethyst', Argument/Subject 2: 'february'

A:
be birthstone of
****