physician: The hormone melatonin has shown promise as a medication for sleep

disorders when taken in synthesized form. Because the long-term side effects of

synthetic melatonin are unknown, however, i cannot recommend its use at this time

Patient: Your position is inconsistent with your usual practice. You prescribe many

medications that you know have serious side effects, so concern about side effects

cannot be the real reason you will not prescribe melatonin.

The patient's argument is flawed because it fails to consider that

(D) the side effects of a medication can take some time to manifest themselves

(E) known risks can be weighed against known benefits, but unknown risks cannot

就这两个选项有问题，看了OG的解释，还是没搞懂，希望NN来帮忙解答下，答案在这两个选项中

E是答案，但我搞不清为什么D不对

我的思路是

physician说的是long-term side effect

patient说的是side effect

需要some time去连接它们。。。