Database: world_development_indicators
Question: What is the lending category of the country with a cereal production of 6140000 metric tons for the year 1966?
SQL: SELECT T1.LendingCategory FROM Country AS T1 INNER JOIN Indicators AS T2 ON T1.CountryCode = T2.CountryCode WHERE T2.IndicatorName = 'Cereal production (metric tons)' AND T2.Value = 6140000 AND T2.Year = 1966