If there is a medical question that double-blind studies cannot answer, that doesn't mean the question is unanswerable. It means we should be more skeptical of

If there is a medical question that double-blind studies cannot answer, that doesn't mean the question is unanswerable. It means we should be more skeptical of non-blinded studies (or worse studies that pretend to be blind), and we should look for alternative ways to address biases.