Task: Question Answering
Input (English): Problem: a group of 55 adults and 70 children go for trekking . if there is meal for either 70 adults or 90 children and if 21 adults have their meal , find the total number of children that can be catered with the remaining food . 
Options: a ) 33 , b ) 54 , c ) 63 , d ) 17 , e ) 01
Output (English): c