Task: Question Answering
Input (English): Problem: the average age of 42 students in a group is 16 years . when teacher â € ™ s age is included to it , the average increases by one . what is the teacher â € ™ s age in years ? 
Options: a ) 31 , b ) 56 , c ) 41 , d ) 59 , e ) none
Output (English): d