Task: Question Answering
Input (English): Problem: a boy perform 5 times a reaction and his reading are 2 , 2.1 , 2 , 2.2 but unfortunately 5 th reading clearly not visible because a drop of chemical fall onto it . but luckily he have mean of all reading which is 2 . please help him in finding 5 th reading . 
Options: a ) 2 , b ) 1.7 , c ) 1.9 , d ) 1.8 , e ) 2.1
Output (English): b