user: Question: What sponsor has the head coach Samad Marfavi?
Columns: ['Team', 'Head coach', 'Team captain', 'Kit maker', 'Shirt sponsor', 'Past Season']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Esteghlal', 'Parviz Mazloomi', 'Farhad Majidi', 'Uhlsport', 'Tehran Municipality & City Bank', '3rd']
SQL:

assistant: SELECT "Shirt sponsor" FROM "Table" WHERE "Head coach" = 'Samad Marfavi';