Question: Before serving as a lieutenant during WW2 and being elected to the Australian House of Representatives, John Jess attended which well-known day and boarding school?

Context paragraphs:
Fay School: Fay School is an independent, coeducational day and boarding school, located on a 66 acre campus some 25 mi from Boston in Southborough, Massachusetts, and is the oldest junior boarding school in the United States.  It has 475 students enrolled from Pre-kindergarten through grade 9; the boarding program (grades 7–9) enrolls 120 students from throughout the United States and more than 19 foreign countries.  Fay opened its Primary School (Pre-K to Grade Two) in 2010 and moved its 6th grade into the Lower School program (now 3rd to 6th) in the 2012–13 school year.

Bagsværd Kostskole og Gymnasium: Bagsværd Kostskole og Gymnasium (Eng: 'Bagsværd Boarding School and Gymnasium'), usually referred to among students, teachers etc. as simply BK, is a private day school, gymnasium, and boarding school situated in Bagsværd, a suburb of Copenhagen.  The vast majority of the 800 pupils and students at BK commute to school every day; the boarding school (Haraldsgave, lit.  "Harald's Gift", commonly known as Haga) only houses up to 60 students.

International School of France: The International School of France, or Ermitage, is an international day and boarding school in Maisons-Laffitte, just outside Paris, France.  The school, which was founded in 1941, offers a French / English bilingual education up to French Baccalaureate / International Baccalaureate level.  This 5 and 7 day boarding school, Ermitage focuses on children from all around the world, not just France and neighboring countries.  In 2009, the school began offering the IB Diploma Programme.  The school is headed by Christopher Hunter.  Enrollment is 1100 students.  Ages range from 2 1/2 (TPS) through 19 (Terminale, or 13 in Great Britain, grade 12 in the U.S.).

Westminster School: Westminster School is an independent day and boarding school in London, England, located within the precincts of Westminster Abbey.  With origins before the 12th century, the educational tradition of Westminster probably dates back as far as AD 960, in line with the Abbey's history.  Boys are admitted to the Under School at age seven and to the senior school at age thirteen; girls are admitted at age sixteen into the Sixth Form.  The school has around 750 pupils; around a quarter are boarders, most of whom go home at weekends, after Saturday morning school.  It is one of the original seven public schools as defined by the Public Schools Act 1868.  Charging up to £7,800 per term for day pupils and £11,264 for boarders in 2014/15, Westminster is the 13th most expensive HMC day school and 10th most expensive HMC boarding school in the UK.  Westminster school achieved the highest percentage of students accepted by Oxbridge colleges over the period 2002-2006.

John Jess: John David Jess, CBE (15 April 1922 – 18 October 2003) was an Australian politician.  Born in Melbourne, he attended Melbourne Grammar School He was a lieutenant in the CMF during WW2, serving in Melbourne and Queensland, before becoming an estate agent.  He was elected to the Australian House of Representatives in a 1960 by-election for the seat of La Trobe, representing the Liberal Party.  He held the seat until his defeat in 1972.  He was instrumental in bringing about the second Royal Commission into the Voyager/Melbourne ship collision in 1964.  He was known throughout his 12-year career in politics as the "Seeker of Justice" for his courage in fighting issues of justice.  Jess died in 2003.

Saint Andrew's School (Boca Raton, Florida): Saint Andrew’s School, in Boca Raton, Florida, is a PreK-12 day and boarding college preparatory school.  Over more than five decades, the School has expanded in scope and mission and today it is a premier co-educational day and boarding School with approximately 1,275 students in Junior Kindergarten through Grade 12.  While the campus has changed, the focus remains to educate the whole child and instill a dedication to lifelong learning.  Saint Andrew's focuses on rigorous college-preparatory education and fosters a learning environment that challenges unique talents, encourages creative endeavors, and supports a wide range of advanced placement courses as well as the esteemed International Baccalaureate curriculum.  SAS expands upon the classic New England preparatory and boarding school traditions with a unique perspective in Southeast Florida, creating a cosmopolitan, global School.  The school is characterized by a balanced life of high goals, hard work, healthy relationships, generosity of spirit, and a sense of play.  SAS strives to inspire students to lead honorable lives of purpose and take on limitless opportunities to impact the world.

Dan Mackinnon: Ewen Daniel "Dan" Mackinnon {'1': ", '2': ", '3': ", '4': "} (11 February 1903 – 7 June 1983) was an Australian politician.  The son of state MLA Donald Mackinnon, he was born in Melbourne and educated at Geelong Grammar School and then attended Oxford University.  He returned to Australia as a grazier at Linton before becoming a company director and serving in the military 1938–43.  In 1949, he was elected to the Australian House of Representatives as the Liberal for Wannon, but he was defeated in 1951.  In 1953 he returned to the House as the member for Corangamite, having been elected in the by-election that followed the death of Allan McDonald.  In 1966, Mackinnon retired from politics and was made a Commander of the Order of the British Empire (CBE).

Westminster School, Adelaide: Westminster School is an independent, Uniting Church, Early Learning to Year 12, coeducational, day and boarding school located at Marion, South Australia, 12 km south of Adelaide.  Founded as a Methodist day and boarding school for boys, the school was opened by the Prime Minister Robert Menzies in 1961 and is named after Westminster School in London.  The school became co-educational in 1978, and has a current enrolment of around 1150 students.

Melbourne Grammar School: Melbourne Grammar School is an independent, Anglican, day and boarding school predominantly for boys, located in South Yarra and Caulfield, suburbs of Melbourne, Victoria, Australia.

Cistercian College, Roscrea: Cistercian College, Roscrea or Roscrea College is a private boarding school in Ireland.  It is a Roman Catholic seven-day boarding school for boys and was founded in 1905.  The current school President and Principal is Mr. Brendan Feehan.The Deputy Principal is Mr Gerard Grealish.  Its pupil population is primarily made up of boarding students, though a small number of teachers' sons also attend as day pupils.

Supporting paragraphs: John Jess Melbourne Grammar School
Answer: Melbourne Grammar School