Refer to the input text as context and select the correct relationship between 'prime' and 'retail' from the available options.
Options: currency, position held, industry, member of

Improving the dark pool while winding down retail market-making is part of Mahajan’s overhaul strategy, which is based on winning business from quantitative hedge funds that already are clients of other parts of Goldman Sachs, such as the prime brokerage.
industry