You will be given a definition of a task first, then some input of the task.
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'.

Problem: 1 = 1,2 = 2,3 = 9,4 = 16,5 = 25 , then 9 = ? 
Options: a ) 1 , b ) 255 , c ) 3 , d ) 445 , e ) 235
Output:
c