instruction: What are the names of Tata trusts which Ratan Tata heads?
context: Ratan Tata was the interim chairman of Tata Sons. He continues to head the main two Tata trusts Sir Dorabji Tata and Allied Trusts and Sir Ratan Tata Trust and their allied trusts, with a combined stake of 66% in Tata Sons, Tata group's holding company.He has served in various capacities in organizations in India and abroad. He is a member of Prime Minister's 'Council on Trade and Industry' and the 'National Manufacturing Competitiveness Council'. He is on the jury panel of Pritzker Architecture Prize – considered to be one of the world's premier architecture prizes.Over the years Tata has served on the Cornell University Board of Trustees, personally advising the school's administration in matters of international involvement, particularly regarding projects connected to India. More broadly, Tata has served on the board's Academic Affairs, Student Life, and Development Committees. In 2013 he was named Cornell Entrepreneur of the Year.He is a director on the boards of Alcoa Inc., Mondelez International and Board of Governors of the East–West Center. He is also a member of the board of trustees of University of Southern California, Harvard Business School Board of Dean's Advisors, X Prize and Cornell University. He is a member on the board of International Advisory Council at Bocconi University.He is also a member of the Harvard Business School India Advisory Board (IAB) since 2006 and previously a member of the Harvard Business School Asia-Pacific Advisory Board (APAB) 2001–2006.[citation needed]In 2013, he was appointed to the board of trustees of the Carnegie Endowment for International Peace.In February 2015, Ratan took an advisory role at Kalari Capital, a venture capital firm founded by Vani Kola.In October 2016, Tata Sons removed Cyrus Mistry as its chairman, nearly 4 years after he took over the reins of the over $100 billion conglomerate, Ratan Tata made a comeback, taking over the company's interim boss for 4 months. On 12 January 2017, Natarajan Chandrasekaran was named as the chairman of Tata Sons, a role he assumed in February 2017.
response: Sir Dorabji Tata and Allied Trusts and Sir Ratan Tata Trust