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

Ex Input:
Problem: bag a contains red , white and blue marbles such that the red to white marble ratio is 1 : 3 and the white to blue marble ratio is 2 : 3 . bag b contains red and white marbles in the ratio of 1 : 4 . together , the two bags contain 40 white marbles . how many red marbles could be in bag a ? 
Options: a ) 8 , b ) 3 , c ) 4 , d ) 6 , e ) 8

Ex Output:
a


Ex Input:
Problem: the marks obtained by polly and sandy are in the ratio 3 : 5 and those obtained by sandy and willy are in the ratio of 5 : 2 . the marks obtained by polly and willy are in the ratio of . . . ? 
Options: a ) 2 : 1 , b ) 3 : 2 , c ) 4 : 3 , d ) 5 : 4 , e ) 6 : 5

Ex Output:
b


Ex Input:
Problem: the ratio of 2 numbers is 2 : 7 and their h . c . f . is 18 . their l . c . m . is ? 
Options: a ) 252 , b ) 243 , c ) 521 , d ) 361 , e ) 600

Ex Output:

a