user: Question: What is the average Total, when Gold is 0, and when Nation is Iran?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1', 'Soviet Union', 12.0, 0.0, 4.0, 16.0]
SQL:

assistant: SELECT AVG("Total") FROM "Table" WHERE "Gold" = 0.0 AND "Nation" = 'Iran';