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

Ex Input:
Problem: 82 a 7 + 6 b ____ 190 if a and b represent positive single digits in the correctly worked computation above , what is the value of a + 2 b ? 
Options: a ) 2 , b ) 6 , c ) 9 , d ) 11 , e ) 12

Ex Output:
b


Ex Input:
Problem: a bus 75 m long is running with a speed of 21 km / hr . in what time will it pass a woman who is walking at 3 km / hr in the direction opposite to that in which the bus is going ? 
Options: a ) 5.75 , b ) 7.62 , c ) 11.25 , d ) 4.25 , e ) 3.25

Ex Output:
c


Ex Input:
Problem: what is the distance between two parallel chords of length 32 cm and 24 cm in a circle of radius 20 cm ? 
Options: ['a ) 1 or 7', 'b ) 3 or 21', 'c ) 4 or 28', 'd ) 2 or 14', 'e ) 5 or 14']

Ex Output:

c