Task: Question Answering
Input (English): Problem: in a group of 90 students , 36 are taking history , and 30 are taking statistics . if 59 students are taking history or statistics or both , then how many students are taking history but not statistics ? 
Options: a ) 9 , b ) 19 , c ) 23 , d ) 27 , e ) 29
Output (English): e