Question: What was the name of a thoroughbred racehorse that won the 1889 Epsom Oaks and was owned by the Earl of Dunraven and Lord Randolph Churchill, a man who created the National Union of the Conservative Party?

<P0-S0> Diminuendo (9 February 1985 – 2010) was an American-bred, British-trained Thoroughbred racehorse and broodmare best known for winning the classic Epsom Oaks in 1988. <P0-S1>  She was one of the best two-year-old fillies of 1987, when she won all four of her races including the Cherry Hinton Stakes and Fillies' Mile. <P0-S2>  In 1988 she was beaten in her first two races, but won her next four, taking the Musidora Stakes, Epsom Oaks, Irish Oaks and Yorkshire Oaks. <P0-S3>  She finished second when favourite for the St. Leger Stakes and ended her racing career by finishing unplaced in the Prix de l'Arc de Triomphe, but was rated the best three-year-old filly of the season in Europe. <P0-S4>  She was then retired to stud, where she had some success as a broodmare. <SEP> <P1-S0>  The horse was owned by Lord Randolph Churchill and the Earl of Dunraven during her three-year racing career. <P1-S1>  She was nicknamed "Abscess on the Jaw" during her career due to the difficulty the public had pronouncing her name. <P1-S2>  A versatile racehorse, she was able to win major races at distances ranging from six furlongs to one and a half miles. <P1-S3>  Retired from racing in 1891, L'Abbesse was the dam of the influential German broodmare Festa and the leading stallion Desmond. <P1-S4>  L'Abbesse de Jouarre died 6 March 1897 during foaling. <P1-S5> L'Abbesse de Jouarre (1886 – 6 March 1897) was a Thoroughbred racehorse that won the 1889 Epsom Oaks. <SEP> <P2-S0> Lord Randolph Henry Spencer-Churchill (13 February 184924 January 1895) was a British statesman. <P2-S1>  He inspired a generation of party managers, created the National Union of the Conservative Party, broke new ground in modern budgetary presentations, attracting admiration and criticism alike from across the political spectrum. <P2-S2>  Churchill was a genuine Tory radical, who coined the term Tory Democracy. <P2-S3>  His most acerbic critics resided in his own party among his closest friends; but his disloyalty to Lord Salisbury was the beginning of the end of what should have been a glittering career. <P2-S4>  His devoted son, Winston, who hardly knew his father in life, wrote a biography of him. <SEP> <P3-S0> Jet Ski Lady (foaled 20 February 1988) was an American-bred, Irish-trained Thoroughbred racehorse, best known for winning the Epsom Oaks in 1991. <P3-S1>  In a racing career which lasted from June 1990 to October 1991 the filly ran ten times and won four races. <P3-S2>  After winning twice as a two-year-old, Jet Ski Lady competed against colts with mixed success in early 1991 before winning the Classic Oaks over one and a half miles at Epsom Downs Racecourse. <P3-S3>  Her winning margin of ten lengths was the second widest in the race's history and her starting price of 50/1 made her the equal longest-priced winner of the Oaks on records. <P3-S4>  She subsequently finished second in both the Irish Oaks at the Curragh and the Yorkshire Oaks at York. <P3-S5>  She was retired to stud after finishing unplaced in the Prix de l'Arc de Triomphe.