US President Barack Obama will start a three-day landmark trip to India on Prime Minister Narendra Modi's invitation to build on what he has said will be one of the defining relationships of the 21st century. Obama, who is the first US president to be invited as the chief guest at the Republic Day parade, will disucss some of the key issues at hand including of strategic importance, counter-terrorism engagemnet, defence, economic ties, civil nuclear & renewable energy with governmnet of India. Cyrus Mistry, Chairman of Tata Sons, will lead the Indian side to the forum of top chief executives from India and US. David M Cote from Honeywell will co-chair CEO forum from US side. While many are delighted with the agenda of discussions among the US President & Indian Prime Minster, health activists & organizations have expressed concern over the US government’s heightened efforts  to undermine access to affordable medicines from India. They are particularly concerned about dilution of Section 3(d) of the Patent Act of 1970 that allegedly restricts the vested business interest of pharmaceutical companies in US and EU in India.