一道GWD题， 赐教

Most insomnia is not an illness or a physical condition
so much as a symptom

w of another problem that may simply be a reaction to
certain medications, anxiety about travel, or stress before a job
interview.

1. an
        illness or a physical condition so much as a symptom of another problem
        that may simply be a reaction to certain medications
2. an
        illness or a physical condition so much as symptomatic of another problem
        that may be a simple one, like a reaction caused by certain medications
3. so
        much an illness or a physical condition but a symptom of another problem
        that may be as simple as when certain medications cause a reaction
4. so
        much an illness or a physical condition, but it is a symptom of another
        problem, maybe a simple one like certain medications causing a reaction
5. so
   much an illness or a physical condition but symptomatic of another problem,
   maybe simply a reaction to certain medications

but优于任何其他转折形式，当然，这个选项的语法逻辑必须正确。

某某症状 is symptomatic of 一种病  是固定搭配用在医学术语中。一般来说 某某现象 is a symptom of 某某非医学问题

没办法，夷狄认为symptomatic更加学术化。