Task: Question Answering
Input (English): Problem: 12 persons can complete the work in 18 days . after working for 6 days , 4 more persons added to complete the work fast . in how many more days they will complete the work ? 
Options: a ) 10 days , b ) 9 days , c ) 8 days , d ) 7 days , e ) 6 days
Output (English): b