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: the distance between west - town to east - town is 14 kilometers . two birds start flying simultaneously towards one another , the first leaving from west - town at a speed of 5 kilometers per minute and the second bird , leaving from east - town , at a speed of 2 kilometers per minute . what will be the distance , in kilometers , between the meeting point and west - town ?
Options: a ) 3 . , b ) 7 . , c ) 10 . , d ) 12 . , e ) 15 .

Ex Output:
c

Ex Input:
Problem: a and b can do a work in 12 days , b and c in 15 days , c and a in 20 days . if a , b and c work together , they will complete the work in :
Options: a ) 5 days , b ) 7 5 / 6 days , c ) 10 days , d ) 15 2 / 3 days , e ) none of these

Ex Output:
c

Ex Input:
Problem: water boils at 212 f or 100 c and ice melts at 32 f or 0 c . if the temperature of a pot of water is 55 c , what is the temperature of the pot of water in f ?
Options: a ) 116 f , b ) 125 f , c ) 131 f , d ) 138 f , e ) 145 f

Ex Output:
c