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: in n is a positive integer less than 200 , and 18 n / 60 is an integer , then n has how many different positive prime factors ? 
Options: a ) 2 , b ) 3 , c ) 5 , d ) 6 , e ) 8

Ex Output:
a


Ex Input:
Problem: for how many integer values of n will the value of the expression 4 n + 7 be an integer greater than 1 and less than 120 ? 
Options: a ) 22 , b ) 24 , c ) 26 , d ) 28 , e ) 30

Ex Output:
e


Ex Input:
Problem: the average weight of a , b and c is 43 kg . if the average weight of a and b be 48 kg and that of b and c be 42 kg , then the weight of b is : 
Options: a ) 55 kg , b ) 53 kg , c ) 49 kg , d ) 52 kg , e ) 51 kg

Ex Output:

e