You will be given a definition of a task first, then some input of the task.
You are given a review of Amazon's food products. Your task is to divide them into two classes: negative or positive, depending on the content of the review.

I like the taste of this dressing, but realized that it contains the additive mono sodium gluconate. This chemical gives me migraines, which is very difficult to tolerate. I am sorry to say that I will no longer purchase this dressing unless they remove this flavor enhancer.
Output:
Negative