user: Question: WhAt is the pArAmeter when the best fit (WMAP only) is .9 ± .1, And symbol is A?
Columns: ['Parameter', 'Symbol', 'Best fit (WMAP only)', 'Best fit (WMAP, extra parameter)', 'Best fit (all data)']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Age of the universe ( Ga )', 't_0', '.4 ± .3', '–', '.7 ± .2']
SQL:

assistant: SELECT "Parameter" FROM "Table" WHERE "Best fit (WMAP only)" = '.9 ± .1' AND "Symbol" = 'A';