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: 'The astronomer William Herschel discovered Uranus on the 13th of March 1781 .', Argument/Subject 1: 'william herschel', Argument/Subject 2: 'uranus'
discover

Sentence: 'Buy V-RX Va herbal alternative to Viagra from the online sex store at SexyFun.co.uk .', Argument/Subject 1: 'viagra', Argument/Subject 2: 'online'
buy

Sentence: 'The Senate Banking Committee will hold a hearing on the nomination of Ben Bernanke to be Chairman of the Federal Reserve Board .', Argument/Subject 1: 'ben bernanke', Argument/Subject 2: 'federal reserve board'

be chairman of