In this task, you need to answer the given multiple-choice question on the gain. Gain is the value by which to multiply the input. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Example Input: Problem: the calendar of the year 2028 can be used again in the year ? 
Options: a ) 2041 , b ) 1951 , c ) 2056 , d ) 1971 , e ) 1973
Example Output: c

Example Input: Problem: double of quarter of 5 percent written as a decimal is : 
Options: a ) 0.003 , b ) 0.0005 , c ) 0.025 , d ) 0.005 , e ) none of these
Example Output: c

Example Input: Problem: a fruit seller had some apples . he sells 35 % and still has 6500 apples . originally , he had ? 
Options: a ) 650 apples , b ) 600 apples , c ) 772 apples , d ) 700 apples , e ) none
Example Output:
e