A Patient Asks a Nurse Why Drugs That Have Been

A patient asks a nurse why drugs that have been approved by the FDA still have unknown side effects. What will the nurse tell the patient?

A) Testing for all side effects of a medication would be prohibitively expensive.
B) Patients in drug trials often are biased by their preconceptions of a drug's benefits.
C) Researchers tend to conduct studies that will prove the benefits of their new drugs.
D) Subjects in drug trials do not always represent the full spectrum of possible patients.