Question: Cecelia Wolstenholme won the 200 yd breaststroke at the 1930 British Empire Games, beating who? 
Context: Frederick "Freddie" George Matt Milton (21 October 1906 – August 1991) was an English water polo player and competitive swimmer who represented Great Britain at the Olympics and England at the British Empire Games during the 1930s.  He was part of the British water polo team that finished eighth at the 1936 Summer Olympics.  He played four matches.  He was born in Marylebone, Great Britain.  As a swimmer, he won a silver medal in the 4×200 yards freestyle relay at the 1930 British Empire Games in Hamilton, Ontario.  In the 400-yard freestyle he finished fifth.  His wife Irene Pirie-Milton and brother in law Bob Pirie were Canadian swimmers who also competed at the 1936 Olympics. Jeannette "Jenny" Hermine Kastein (24 January 1913 – 20 October 2000) was a Dutch breaststroke swimmer.  She won a silver medal in the 200 m breaststroke at the 1931 European Championships, behind Cecelia Wolstenholme.  Next year she set four world records in the 400 m and 500 m breastroke (unofficial events), but could not compete in the Olympics due to the overall financial problems related to the Great Depression.  She won the national titles in the 200 m in 1933, 1935 and 1936, yet her performance declined, and at the 1936 Summer Olympics she finished in a mere seventh place. Stanley ("Stan") Arthur Lay, {'1': ", '2': ", '3': 'MBE', '4': "} (27 July 1906 – 12 May 2003), was a New Zealand track and field athlete who competed in javelin throwing at the 1928 Summer Olympics at Amsterdam, the 1930 British Empire Games in Hamilton, the 1938 British Empire Games in Sydney, and the 1950 British Empire Games in Auckland. The 1930 British Empire Games (French: "Jeux de l'Empire britannique de 1930") were the first of what later become known as the Commonwealth Games, and were held in Hamilton, in the province of Ontario in Canada from 16–23 August 1930. William Albert Love (1911 – 8 November 1943) was a Welsh boxer who competed for England in the 1930 British Empire Games.  He was born in Cardiff.  At the 1930 Empire Games, he won the bronze medal in the lightweight class. George Augustus Golding (6 May 1906 – 30 August 1999) was an Australian runner who won a bronze medal in the 440 yd event at the 1930 British Empire Games.  Together with his future wife Clare Dennis he competed in the 1932 Summer Olympics and placed sixth in the 400 metres; he was eliminated in the semi-finals in the 400 metre hurdles. Cecelia Wolstenholme (18 May 1915 – October 1968), later known by her married name Cecelia Thornton, was an English competitive swimmer who represented Great Britain in the Olympic Games and European championships, and England in the British Empire Games.  She won the 200 yd breaststroke at the 1930 British Empire Games and the 200 m breaststroke at the 1931 European Championships, beating Jenny Kastein.  She competed in the latter event at the 1932 Summer Olympics, but failed to reach the final.  Her younger sister Beatrice was also an international swimmer. Reginald "Reg" Heber Thomas AFC (11 January 1907 – 14 March 1946) was a Welsh middle-distance runner.  He competed at the 1928 and 1932 Summer Olympics and the 1930 British Empire Games.  He missed the 1936 Summer Olympics because of injury, and did not compete in the 1934 British Empire Games for Wales, because of English objections.  At both Olympics he was eliminated in the first round of the 1500 metres event.  At the 1930 Empire Games he won the gold medal in the mile and the silver medal in the 880 yards race.  He could not compete for Wales because Wales did not have a national athletics association at the time.  Welsh track and field athletes could only compete for England in 1930 although Welsh swimmers did compete for their home nation. Due to the success of the first 1930 British Empire Games in Hamilton, Canada, a meeting of representatives from Great Britain, its colonies and territories decided that the games, similar to the Olympic Games should be held every four years, and that an authoritative organisation should be formed.  Following the 1932 Summer Olympics, it was decided to form the ""British Empire Games Federation"" who would be responsible for the organising of the games.  The name of the federation was changed in 1952 to the ""British Empire and Commonwealth Games Federation"", and again in Jamaica in 1966 to the ""British Commonwealth Games Federation"", until eventually being changed again in Christchurch, New Zealand in 1974 to the ""Commonwealth Games Federation"". Albert William Puddy (December 19, 1916 – June 23, 1999) was a competition swimmer who represented Canada in international swimming events during the 1930s.  At the 1934 British Empire Games in London, he won a gold medal as a member of the first-place Canadian team in the 3x110-yard medley relay, and a bronze medal in the 200-yard breaststroke.  He also swam in the 200-metre breaststroke at the 1936 Summer Olympics in Berlin, Germany, but did not advance beyond the first round.
Answer: Jenny Kastein