Mumbai, May 14 -- The dollar index retreated under 101 mark on Wednesday after US data showed softer-than-expected US inflation data. The consumer price index (CPI) rose 2.3% year-over-year in April-slightly below March's 2.4% reading and market expectations. Core CPI, which excludes food and energy, increased by 2.8% annually, in line with both the previous figure and forecasts. On a monthly basis, headline and core CPI each rose 0.2%. April's figures also mark a four-year low for annual headline inflation. However, easing tensions on US-China trade front reducing possibility of a recession could keep the greenback supported. The US and China agreed to reduce tariffs on each other after two days of negotiations in Geneva, Switzerland. Th...