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: if a man earns rs 20 on first day and spends rs 15 on second day , and earns rs 20 on third day and spends rs 15 on fourth day and goes on on which day he will be having rs 60 .
Options: a ) 40 rs , b ) 45 rs , c ) 50 rs , d ) 55 rs , e ) 60 rs

Ex Output:
e

Ex Input:
Problem: what is the maximum number of pieces of birthday cake of size 5 " by 5 " that can be cut from a cake 15 " by 15 " ?
Options: a ) 5 , b ) 10 , c ) 16 , d ) 20 , e ) 9

Ex Output:
e

Ex Input:
Problem: a and b go around a circular track of length 300 m on a cycle at speeds of 18 kmph and 54 kmph . after how much time will they meet for the first time at the starting point ?
Options: a ) 120 sec , b ) 198 sec , c ) 60 sec , d ) 665 sec , e ) 276 sec

Ex Output:
c