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

Example Input: Problem: find the two digit number , such that the ratio is 7 / 4 of original number to the number formed by reversing the digits . 
Options: a ) 20 , b ) 21 , c ) 22 , d ) 23 , e ) 24
Example Output: b

Example Input: Problem: there are 180 doctors and nurses at a hospital . if the ratio of doctors to nurses is 2 to 3 , how many nurses are at the hospital ? 
Options: a ) 100 , b ) 104 , c ) 108 , d ) 112 , e ) 116
Example Output: c

Example Input: Problem: the ratio of the present age of sandy to that of molly is 9 : 2 . eight years from now , the ratio of the ages of sandy to molly will be 5 : 2 . what was sandy ' s age 6 years ago ? 
Options: a ) 18 , b ) 21 , c ) 24 , d ) 27 , e ) 30
Example Output:
b