user: Question: What is the A.G. value associated with D3&4 of 46 and transmitter of Seaham?
Columns: ['Transmitter', 'BBCA', 'BBCB', 'D3&4', 'ARQA', 'ARQB', 'Pol.', 'A.G.']
Types: ['text', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Allenheads', 27.0, '21', '24', 'N/A', 'N/A', 'V', 'A K']
SQL:

assistant: SELECT "A.G." FROM "Table" WHERE "D3&4" = '46' AND "Transmitter" = 'Seaham';