New Delhi: Retail inflation fell sharply to 4.59% in December, mainly due to declining food prices, government data showed on Tuesday.Retail inflation based on the Consumer Price Index (CPI) was 6.93% in November.Food inflation declined to 3.41% in December in 2020, compared to 9.5% in the previous month, according to the data released by the Ministry of Statistics and Programme Implementation.The Reserve Bank of India (RBI) factors in retail inflation while arriving at its monetary policy.