The headline inflation has been negative since November 2014 while it was 2.38 per cent in Sept.
Pronab Sen said that the divergence between WPI and retail inflation would gradually equalise.
Given the deflationary trend, globally and at home, the RBI needs to urgently review its monetary policy stance.
While the RBI criticises policy, it does not use its own limited authority effectively.
The headline inflation was at -2.06 per cent in February. It was 6 per cent in March 2014.
However, the food prices remained high, according to the the data released.
RBI may soften its policy stance in the forthcoming monetary policy review in February.
The big picture points to the need for significant monetary easing.
Fuel and power index also declined by 0.3 per cent due to lower price of petrol.
Across the world, WPI has been replaced by PPI given its comprehensive nature.
The PPI provides a broader coverage in terms of products and industries and it also includes services, something which is not a part of the WPI.
Food prices remain high but vegetable costs, as a group, fall.
The Reserve Bank Of India is scheduled to announce the next monetary policy on April 1.
India Inc,while acknowledging the development,sought some relief on the interest rate front for propping up the economic growth.
RBI must keep its focus,resist being diverted from the objective of price stability