Task: Question Answering
Input (English): Problem: a and b can do a piece of work in 4 days , b and c in 6 days , c and a in 3 days . how long will c take to do it ? 
Options: a ) 8 days , b ) 10 days , c ) 12 days , d ) 4 days , e ) 12 days
Output (English): a