Correct Answer - B
`(81^((1)/(log_(5)9))+3^((3)/(log_(sqrt(6)3))))/(409)((sqrt(7))^((2)/(log_(25)7))-(125)^(log_(25)6))`
`=(9^(log_(9)5^(2))+3^(log_(3)(sqrt(6))^(3)))/(409)(7^(log_(7)25)-5^(log_(5)6^(3//2)))`
`= (25+6sqrt(6))/(409)[25-6sqrt(6)]`
`=(625-216)/(409)=(409)/(409)=1`