Task: Question Answering
Input (English): Problem: there is a sufficient food for 200 men for 20 days after 15 days 100 men leave the place . for how many days will the rest of the food last for the rest of the men ? 
Options: a ) 10 days , b ) 5 days , c ) 15 days , d ) 12 days , e ) 10 days
Output (English): a