Task: Question Answering
Input (English): Problem: the spherical ball of lead 3 cm in diameter is melted and recast into 3 spherical balls . the diameters of two of these are 1 ½ cm and 2 cm respectively . the diameter of third ball is ? 
Options: a ) 2.66 cm , b ) 2.5 cm , c ) 3 cm , d ) 3.5 cm , e ) 4 cm
Output (English): b