Question: To which college is the school that Himanshu Roy is an alumni of affiliated with?

Context paragraphs:
List of Columbia University alumni: This is a sorted list of notable persons who are alumni of Columbia University, New York City.  For further listing of notable Columbians see: Notable alumni at Columbia College of Columbia University; Columbia University School of General Studies; Barnard College; Columbia Law School; Columbia Business School; Columbia University Graduate School of Journalism; Columbia Graduate School of Architecture, Planning and Preservation; Columbia University College of Physicians and Surgeons; Columbia University Graduate School of Education (Teachers College); Fu Foundation School of Engineering and Applied Science; Columbia Graduate School of Arts and Sciences; Columbia University School of Professional Studies; Columbia University School of the Arts; and the School of International and Public Affairs.

Himanshu Roy: Himanshu Roy is the Additional Director General of Police of Maharashtra (Planning and Co-ordination).  He was ATS Maharashtra Chief.  He is an IPS officer of Maharashtra Cadre of 1988 batch and alumni of St. Xavier's College, Mumbai who hail form Rajput-origin.

St. Xavier's College, Mumbai: St. Xavier's College, Mumbai, (informally Xavier's) is a college affiliated to the University of Mumbai offering undergraduate and postgraduate degrees in Arts, Science, Commerce and Management.  Xavier's was the first college to be granted autonomy by the University of Mumbai in 2010.  In 2006, St. Xavier's was awarded 'A+' grade by National Assessment and Accreditation Council (NAAC).

Royal College Union: The Royal College Union (RCU) is the alumni association of the Royal College Colombo.  Founded in 1891 as a society for alumni of the college, it is the oldest such alumni society in Sri Lanka.  The Royal College Union was set up to further the interests of the College and its past and present members, and to keep former pupils in touch with each other and with the school.  Annually the RCU organizes many sporting events including the Royal-Thomian, the Bradby Shield Encounter, the Royal Thomian Regatta as well as national initiatives such as EDEX and carry out development projects for the college, as well as manage and maintain much of the school's infurstutcure such as the Hostel, Royal College Sports Complex, the J.R. Jayawardene Sports Complex, RCU Skills Centre and the Swimming Pool.

Alumni magazine: An alumni magazine is a magazine published by a university, college, or other school or by an association of a school's alumni (and sometimes current students) in order to keep alumni abreast of fellow alumni and news of their university, often with an implicit goal of fundraising.

List of Dartmouth College alumni: This list of Dartmouth College alumni includes currently matriculating students and alumni who are graduates or non-matriculating students of Dartmouth College and its graduate schools.  In addition to its undergraduate program, Dartmouth offers graduate degrees in nineteen departments and includes three graduate schools: the Tuck School of Business, the Thayer School of Engineering, and Dartmouth Medical School.  Since its founding in 1769, Dartmouth has graduated 238 classes of students and today has approximately 66,500 living alumni.

Nonstop Liberal Arts Institute: The Nonstop Liberal Arts Institute is the educational program supported by Nonstop Antioch, a movement of organized alumni, students, staff and former faculty of Antioch College to keep Antioch College alive and operating in Yellow Springs, Ohio.  Nonstop is supported by the Antioch College Alumni Association through the College Revival Fund.  The Nonstop effort was not supported by or affiliated with Antioch University.

Manas Vidyalaya: Manas Vidyalaya is a co-educational school located in Jehanabad & it is affiliated up to 10+2 level.  It is run by Nav Mahabodhi & Welfare Charitable Trust headed by Dr. Nawal Kishore who has been conferred upon Rashtriya Shiksha Ratan Award by IEDRA.  He has carved out a niche for himself in society as an eminent educationist of Bihar.  The school has currently four branches in Jehanabad, babhana, walidad & kaler.  This school has the privilege of being the first CBSE school in Jehanabad district.  It has a large campus equipped with all modern facilities.  The school has produced a number of students who have done exceptionally well in society.  Apart from studies, this school is mainly known for its discipline & any violation is dealt with iron hand.  The school organizes excursion every year for students & its annual day celebration is the most talked about event in the town.  The school publishes its magazine "MANAS PRABHA" every year on the occasion of annual day.some of the notable alumni of this school include Major Sumit sharma, IPS Himanshu singh, Nitin Sharma at Massachusetts Institute of technology & many more.

Beijing National Day School: Beijing National Day School（BNDS）, or Beijing October First School（BOFS） (Chinese: 北京十一学校 or 北京市十一学校) is a junior high and high school in established in 1952.  Beijing National Day School is one of the most prestigious high schools in China. It is located in Yuquanlu, Haidian District, Beijing, China.  The school was affiliated with the People's Liberation Army of the People's Republic of China as the unique school for PLA's High-Level Officers' children.  It opened to recruit students from 1964 and became a general high school of Beijing, and no longer belongs to the PLA.  In recent years, there are about sixty graduates every year admitted to Peking University and Tsinghua University, which are two of the most prestigious colleges in mainland China.  This number accounts for one-fifth of graduates each year.  The overall college admission result ranks in the second place in Haidian School District, only behind The High School Affiliated to Renmin University of China(RDF), which is the best High School in mainland China.  On the other hand, one-third graduate chooses to pursue their college degree abroad, learning cutting-edge theories from the western world.  In a 2016 ranking of Chinese high schools that send students to study in American universities, Beijing National Day School ranked number 4 in mainland China in terms of the number of students entering top-tier American universities.  Beijing National Day School has cultivated many successful alumni in the past decades.  There are many alumni of BNDS working at financial service industry in both mainland China and overseas, People's Liberation Army (PLA), Central Government of People's Republic of China and monopolistic State-Owned Corporations.  Successful alumni include CEOs of monopolistic State-Owned Corporations and High-Level Officers of People's Liberation Army(PLA).

List of Bates College people: This list is of notable people associated with Bates College includes matriculating students, alumni, faculty, trustees and honorary degree recipients of Bates College in Lewiston, Maine.  Members of the Bates community are known as "Batesies".  This list also includes students of the affiliated Maine State Seminary, Nichols Latin School, and Cobb Divinity School.  Bates alumni have included leaders in science, religion, politics, the Peace Corps, medicine, law, education, communications, and business; and acclaimed actors, architects, artists, astronauts, engineers, human rights activists, inventors, musicians, philanthropists, and writers.  As of 2015, there are 24,000 Bates College alumni.  In 2016, two Bates alumni were featured on the "Forbes"' 30 Under 30 list.

Supporting paragraphs: Himanshu Roy St. Xavier's College, Mumbai
Answer: University of Mumbai