The government has said that inflation surged to 8.56 per cent in January, the highest in over 13 months. Over one-year high inflation was led by costlier sugar and potato prices. Sugar rates rose by 58.96 per cent while potatoes turned costlier 53.39 per cent. The high inflation has fuelled concerns that the apex bank could further tighten the monetary measures initiated earlier this month in its third quarter monetary policy review.