In this task, you need to provide the correct option for a given problem from the provided options.

Input: Consider Input: Problem: what is the square root of 261,121 ?
Options: a ) 476 , b ) 489 , c ) 497 , d ) 511 , e ) 524

Output: d

Input: Consider Input: Problem: find the compound ratio of ( 2 : 5 ) , ( 6 : 11 ) and ( 11 : 2 ) is
Options: a ) 3 : 2 , b ) 2 : 1 , c ) 1 : 2 , d ) 6 : 5 , e ) 2 : 3

Output: d

Input: Consider Input: Problem: in a college , the ratio of the number of boys to girls is 8 : 5 . if there are 300 girls , the total number of students in the college is
Options: a ) 420 , b ) 520 , c ) 620 , d ) 780 , e ) 820
Output: d