Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Quackery

It's all in your head. There. I just saved you some money and aggravation. You now know what this book saysHealing Back Pain: The Mind-Body ConnectionI started reading with an open mind and finished reading in anger. It is hard enough dealing with this problem without some quack adding fuel to the fire. For those of us in pain, Forget You, as Ceelo Green says.