Brazilian President Dilma Rousseff has unveiled the torch to be used at the 2016 Olympics in Rio de Janeiro.She said the Games would bring honour and pride to the country.Ms Rousseff, who has seen her popularity plunge amid a serious economic crisis, says the country will rise to the challenge and will organise a safe and successful Games.The torch relay will begin in the Brazilian capital in May and will end at Rio's Maracana stadium in August, at the Olympic's opening ceremony.