Task: Question Answering
Input (English): Problem: in the figure given below , abc and cde are two identical semi - circles of radius 2 units . b and d are the mid points of the arc abc and cde respectively . what is the area of the shaded region ? 
Options: ['a ) 4 π - 1', 'b ) 3 π - 1', 'c ) 2 π - 4', 'd ) ½ ( 3 π - 1 )', 'e ) 2 π - 2']
Output (English): c