Find the countries in south Asia which are in the low-income group. What is the source of their recent income and expenditure data? List it alongside the table name of the countries.
South Asia is the name of the region; IncomeGroup = 'Low income';
SELECT TableName, SourceOfMostRecentIncomeAndExpenditureData FROM Country WHERE Region = 'South Asia' AND IncomeGroup = 'Low income'