Grammar question: "extracting some phrase out of a coordinate structure"

00I am working on the issue of extracting some phrase out of a coordinate structure of the form "[A and B]".  As you know, it is generally not allowed to do so.  For example, "*Which boy did you meet [Susan and --]?  (as a response to "I met Susan and a boy ") is unacceptable. Or "*This is the senator that ." is unacceptable.  But exceptionally, it is possible to do so, as in the case I cited earlier: "What kind of cancer can you [eat herbs and not get --]?" as opposed to "*Which thief have [you identified -- and we have arrested  his accomplice]?"  In this context, I am interested in the kind of a paraphrase that is as faithful to the coordinate construction as possible yet possible in English (marginally, or even if unacceptable, semantically intelligible).  That is why I suggested two possibilities: "What kind of cancer is it that if you eat herbs, you won't get (it)?" (the assumption here is that the coordination at hand is semantically not coordinate but subordiante; namely "and" means something like "if") or "What kind of cancer can you eat herbs so that you won't get (it)?" (this departs from my assumption of "and" being conditioinal in this context at least).   Could you choose between the two or suggest a better one that is as close to the original sentence semantically and constructioanlly as possible, in your intuitive judgment?12blockquote