Country's annual consumer price inflation was 7.65 percent last month. Inflation as measured by the WPI eased to a 26-month low of 6.55 percent in the same month. The annual consumer price index (CPI) data released for the first time today, measures retail prices in major food groups, fuel, clothing, housing and education across rural and urban areas.Unlike most central banks, which mainly use the CPI to monitor inflation and set monetary policy, the Reserve Bank of India (RBI) has long used the wholesale price index (WPI) as India's main inflation gauge.The RBI signaled last month its readiness to cut rates if there was a sustained decline in inflation.