Final answer:
The patient's right to refuse medication is established by the Patient Self-Determination Act, which upholds the principle of autonomy.
Step-by-step explanation:
The patient's refusal to take medication is an exercise of their principle of autonomy, which states that patients have the right to make decisions about their own healthcare. The principle of autonomy allows patients to refuse treatments or interventions, even if recommended by their doctor, as long as they are competent to make decisions.
This right is established by the Patient Self-Determination Act, which ensures that patients have the right to make decisions about their own healthcare and be informed about their treatment options and alternatives.
Option 4, The Patient Self-Determination Act, is the correct answer.