Task: Question Answering
Input (English): Problem: a rectangular plot measuring 90 metres by 50 metres is to be enclosed by wire fencing . if the poles of the fence are kept 4 metres apart , how many poles will be needed ? 
Options: ['a ) 55', 'b ) 70', 'c ) 57', 'd ) 58', 'e ) none of these']
Output (English): b