Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the AG value associated with a D3&4 of 41?

### Inputs:
table_name: table, columns: ['Transmitter', 'BBCA', 'BBCB', 'D3&4', 'ARQA', 'ARQB', 'Pol.', 'A.G.']

### Response:
SELECT A.G. FROM table WHERE D3&4 = 41