Task: Question Answering
Input (English): Problem: a and b can finish a work together in 12 days , and b and c together in 16 days . if a alone works for 5 days and then b alone continues for 7 days , then remaining work is done by c in 13 days . in how many days can c alone finish the complete work ? 
Options: a ) 22 days , b ) 21 days , c ) 25 days , d ) 24 days , e ) 23 days
Output (English): d