Refer to the input text as context and select the correct relationship between 'Sabadell' and 'euro' from the available options.
Options: industry, distribution format, currency, chief executive officer

MADRID, Sept 14 (Reuters) - Spanish bank Sabadell is considering making a bid for an 18 billion euro ($20.4 billion) mortgage portfolio held by British nationalised banks Northern Rock and Bradford & Bingley, a source familiar with the process said on Monday.
currency