A neurologist said to the patient: "The synthetic drug S that appears on the market has a good effect on insomnia, but because the long-term side effects of S are unclear, I do not recommend the use of this drug. " Some patients countered: " You have different words and deeds, and you have prescribed many medicines with side effects, so the real reason you refuse to use S medicine is not the side effects of the medicine. ". The patient's perspective is flawed because ___________. ['After using it for a while, the side effects of S medicine will naturally appear.', 'Known risks can be reduced by specific methods, while unknown risks cannot.', 'Doctors may not believe in the efficacy of S medicine instead of worrying about its side effects.', 'Side effects and coping strategies of synthetic and natural medicines are different.']