Task: Question Answering
Input (English): Problem: a hollow iron pipe is 21 cm long and its external diameter is 8 cm. if the thickness of the pipe is 1 cm and iron weights 8 g / cm cube, then find the weight of the pipe.
Options: ['a. 3.696 kg', 'b. 3.686 kg', 'c. 2.696 kg', 'd. 2.686 kg', 'e. none of these']
Output (English): a