Task: Question Answering
Input (English): Problem: calculate the area of a triangle , if the sides are 13 cm , 12 cm and 5 cm , what is its area ? 
Options: ['a ) 36 cm 2', 'b ) 35 cm 2', 'c ) 30 cm 2', 'd ) 32 cm 2', 'e ) 31 cm 2']
Output (English): c