Instruct: Classify a review into positive or negative sentiment.
Query: An excellent book on the topic

This book offers a detailed look at the causes and cures for the acne sufferers. The program he recommended is easy enough to follow on a daily basis. He doesn't recommend any of his products but we have to search for ourselves.I think the author doesn't want any conflict of economical interests to offer his product line but spread the true science of curing the acne itself. It took me a long time to search and locate all the products he recommended in this book, but I have gained more knowledge in the process. I have found the acnerx kit from a company that offers all products this author recommends.I like the author' acne cure program and I highly recommend all acne suffers to buy the book and follow his program. It's a good book. You won't regret it.