Question: Which Wharton, University of Pennsylvania graduate served as chairman of the largest manufacturer of tractors in the world?

full_context: Document 1: Pallonji Mistry: Pallonji Shapoorji Mistry (born 1929) is an Irish Indian construction tycoon and chairman of Shapoorji Pallonji Group. According to "Forbes", his wealth is estimated to be US$16.9 billion as of September 2016. With his 18.4% stake in Tata Sons, he is the single largest shareholder in India's largest private conglomerate Tata Group. He is the chairman of the "Shapoorji Pallonji Group" through which he owns Shapoorji Pallonji Construction Limited, Forbes Textiles and Eureka Forbes Limited. He is the former chairman of Associated Cement Companies. Pallonji gave up his Indian citizenship in 2003 to obtain Irish nationality, because India does not yet allow dual nationality . His son Cyrus was chairman of Tata Sons from November 2011 to October 2016. A short biography of Mistry was written in a 2008 book by Manoj Namburu titled "The Moguls of Real Estate". He was awarded the Padma Bhushan in January 2016 by the Government of India for his contributions in the field of trade and industry.
Document 2: Parmanand Hinduja: Parmanand Deepchand Hinduja (1901–1971) was an Indian businessman, the founder of the Hinduja Group.
Document 3: Mahindra Group: The Mahindra Group is an Indian multinational conglomerate holding company headquartered at Mahindra Towers in Mumbai, India, with operations in over 100 countries around the globe. The group has a presence in aerospace, agribusiness, aftermarket, automotive, components, construction equipment, defence, energy, farm equipment, finance and insurance, industrial equipment, information technology, leisure and hospitality, logistics, real estate, retail, and two wheelers. It is considered to be one of the most reputable Indian industrial houses with market leadership in utility vehicles as well as tractors in India.
Document 4: Cheril Krishna Menon: Cheril Krishna Menon, popularly known as C. K. Menon, is an Indian entrepreneur and philanthropist. He is the chairman and chief executive officer of Behzad Corporation, headquartered in Doha, Qatar, which has presence in many other countries. A recipient of the 2006 Pravasi Bharatiya Samman, Menon was honored again by the Government of India, in 2009, with the fourth highest Indian civilian award of Padma Shri.
Document 5: Tata Group: Tata Group is an Indian multinational conglomerate holding company headquartered in Mumbai, Maharashtra, India. It was founded in 1868 by Jamsetji Tata and gained international recognition after purchasing several global companies. It is India's largest conglomerate and is owned by "Tata Sons", a charity registered with the Charity commissioner in India.
Document 6: Mahindra Tractors: Mahindra Tractors is an international farm equipment manufacturer of Mahindra & Mahindra. In 2010, Mahindra became the world's highest-selling tractor brand by volume. Mahindra's largest consumer base is in India, China, North America, and a growing market in Australia. The company is the largest manufacturer in India and has the capacity to build 150,000 tractors a year.
Document 7: Ashok Leyland: Ashok Leyland is an Indian automobile manufacturing company headquartered in Chennai, India. It is owned by the Hinduja Group.
Document 8: Mahindra Electric: Mahindra Electric Mobility Limited, formerly known as the Reva Electric Car Company, is an Indian company based in Bangalore, involved in designing and manufacturing of compact electric vehicles. The company's first vehicle was the REVAi electric car, available in 26 countries with more than 4,000 of its different versions sold worldwide by mid March 2011. Reva was acquired by Indian conglomerate Mahindra & Mahindra in May 2010. After the acquisition, the company launched the electric hatchback e2o in 2013. Today, the company sells electric vehicles in different segments – the electric CitySmart hatchback e2oPlus, the electric sedan eVerito and electric commercial vehicle eSupro (passenger and cargo).
Document 9: Yusuff Ali M.A.: Yusuff Ali M.A. is an Indian businessman from Nattika Thrissur district of Kerala. He is the Managing Director of Abu Dhabi-headquartered LuLu Group International that owns the Lulu Hypermarket chain in Middle East. With an annual turnover of US $7.4 billion globally, LuLu Group International employs the largest number of Indians outside India. According to Forbes, Yusuff Ali is currently the 24th wealthiest Indian and the 270th (as on 9 August 2016) richest in the world, with a personal wealth of $5.2 billion. In 2013, Ali acquired 4.99% equity in the 93-year-old Thrissur based Catholic Syrian Bank (CSB) and increased his stake in the Aluva-based Federal Bank to 4.47 per cent. In 2016, Ali purchased the Scotland Yard Building in London. According to 2013, Yusuff Ali hold 9.37 per cent share in Cochin International Airport.
Document 10: Reji Abraham: Reji Abraham is the managing director of Aban Group in India. He is on the 2009 Forbes list of the world's wealthiest people. His business empire was begun by his late father, M.A. Abraham, and he was listed on the 2008 Forbes list of the world's wealthiest people. He runs India's largest offshore drilling company Aban Offshore. He resides in Chennai. According to Forbes 2008, Abraham was 605 Richest man in the world with an estimated $2 billion fortune. As of 2009, his wealth has decreased to $770 million.His wealth is mainly dependent on the fortunes of his company, Aban Offshore. Aban Offshore's market cap drastically dipped due to the recent prolonged bear market.
Document 11: Mahindra &amp; Mahindra: Mahindra and Mahindra Limited (M&M) is an Indian multinational car manufacturing corporation headquartered in Mumbai, Maharashtra, India. It is one of the largest vehicle manufacturers by production in India and the largest manufacturer of tractors in the world. It is a part of Mahindra Group, an Indian conglomerate.
Document 12: Tech Mahindra: Tech Mahindra Limited is an Indian multinational provider of information technology (IT), networking technology solutions and Business Process Outsourcing (BPO) to the telecommunications industry. Anand Mahindra is the Chairman of Tech Mahindra, which is headquartered at Pune and has its registered office in Mumbai.
Document 13: S. P. Hinduja: Srichand Parmanand Hinduja (born 28 November 1935) is an Indian-born British billionaire business magnate, investor, and philanthropist. He is the primary shareholder and chairman of Hinduja Group of companies. As of May 2017, together with his brother Gopichand he is the UK's richest man. Since the 1990s, he has been consistently ranked among the UK and Asia's wealthiest people. In May 2017, Hinduja topped the "Sunday Times" Rich List with an estimated wealth of GBP 16.2 billion ($21 billion). Based on the rich list compiled by Asian Media & Marketing Group, Hinduja's wealth is estimated at GBP 19 billion ($24.7 billion). The "Forbes" List in March 2016 ranked him and his brother GP as the world's 58th richest billionaire family with an estimated wealth of $16.4 billion.
Document 14: Ness Wadia: Ness Wadia (born 30 May 1972) is an Indian businessman. Part of the Wadia family, where his parents and several family members are all involved in business—he is also the great grandson of the founder of Pakistan, Muhammad Ali Jinnah—thus making him a direct descendant of Jinnah. Wadia is the Managing Director of Bombay Burmah Trading Corporation, a company which has holdings in most of the Wadia Group subsidiaries, including an indirect majority stake in Britannia Industries. He was the Joint Managing Director of Bombay Dyeing, the flagship company of the Wadia Group, till March 2011 when he stepped down from the post. Wadia is a co-owner of the Indian Premier League cricket team Kings XI Punjab.
Document 15: Keshub Mahindra: Keshub Mahindra (9 October 1923) is an Indian businessman, and the chairman emeritus of the Mahindra Group. He retired as chairman in August 2012 after heading the Group for nearly five decades, handing over the position to his nephew, Anand Mahindra. Mahindra is known for his philanthropy. He is a graduate from Wharton, University of Pennsylvania, US. He joined Mahindra & Mahindra in 1947, and in 1963 took over as chairman.
ground_truth: Keshub Mahindra