Final answer:
The practical nurse's professional responsibility is to inform Mr. Kassam that it is illegal to buy or sell organs in Canada.
Step-by-step explanation:
The practical nurse's professional responsibility in response to Mr. Kassam is to tell him it is illegal to buy or sell organs in Canada (option a). The sale of organs is prohibited by law in many countries, including Canada, due to ethical concerns and to prevent exploitation and trafficking of organs. By providing this information, the nurse is fulfilling their duty to protect the well-being of the patient and uphold legal and ethical standards.