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

Ex Input:
Problem: in a class total 34 students , 16 are have a brother , 15 are have sisters , 9 students do n ' t have either brothers or sisters . find the number of students having both brother and sisters . 
Options: a ) 4 , b ) 5 , c ) 6 , d ) 7 , e ) 8

Ex Output:
c


Ex Input:
Problem: in a college , the ratio of the number of boys to girls is 8 : 4 . if there are 200 girls , the total number of students in the college is 
Options: a ) 420 , b ) 520 , c ) 600 , d ) 720 , e ) 820

Ex Output:
c


Ex Input:
Problem: of the 200 stamps in a collection , 90 are foreign and 80 are more than 10 years old . if 20 stamps are both foreign and more than 10 years old , how many stamps are neither foreign nor more than 10 years old ? 
Options: a ) 50 , b ) 80 , c ) 100 , d ) 130 , e ) 150

Ex Output:

a