In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Ex Input:
Problem: if 5 x = 6 y and xy ≠ 0 , what is the ratio of 1 / 3 * x to 1 / 5 * y ? 
Options: a ) 25 / 6 , b ) 36 / 25 , c ) 2 , d ) 5 / 6 , e ) 25 / 36

Ex Output:
c


Ex Input:
Problem: in 2000 there were 10000 women stockbrokers in the united states . by 2005 the number had increased to 20000 . approximately what was the percent increase ? 
Options: a ) 1 % , b ) 2 % , c ) 1.5 % , d ) 3 % , e ) 4 %

Ex Output:
a


Ex Input:
Problem: what is the 99 th digit after the decimal point in the decimal expansion of 2 / 9 + 3 / 11 ? 
Options: a ) 1 , b ) 2 , c ) 4 , d ) 7 , e ) 9

Ex Output:

c