Task: Explanation
Input (English): Chelsea Building Society is a trading name of Yorkshire Building Society based in Bradford, West Yorkshire. Chelsea merged with the Yorkshire in 2010, at which point Chelsea was the fourth largest building society in the United Kingdom, with assets in excess of £13 billion. Chelsea has 35 branded branches, mainly in the southern areas of England with a large number of these in London. Question: What is the name of the association that the Chelsea Building Society is a member of? Answer: Building Societies Association
Output (English): Chelsea Building Society is a trading name of Yorkshire Building Society based in Bradford, West Yorkshire.