Task: Question Answering
Input (English): Problem: if the sides of a triangle are 21 cm , 19 cm and 5 cm , what is its area ? 
Options: a ) 42.25 cm 2 , b ) 57.5 cm 2 , c ) 42.5 cm 2 , d ) 47.5 cm 2 , e ) 52.5 cm 2
Output (English): d