Part 1. Definition
Given a review text from amazon and its polarity (either positive or negative). Generate answer "True" if given sentence and its polarity match, otherwise generate answer "False". A review is considered positive if the reviewer is satisfied with the product. Otherwise, it is considered negative.
Part 2. Example
Review: Easy product to install. No fuss. Plug it in. It is out of sight behind a couch. I am satisfied. 
 Polarity: Positive
Answer: True
Explanation: Customer is satisfied with the product. Therefore, it has positive polarity.
Part 3. Exercise
Review: A friend suggested this herb to me to help with my awful PMS. After taking Vitex for only three days during PMS, I began to feel horrible: very irritable, nauseous and foggy. After doing some research, I found that a percentage of women react very negatively to this herb -- some people remarked that they initially felt better, but then progressively felt worse and thought they were going crazy; some said they immediately felt terrible. I guess it's a gamble that many of us are willing to take to feel better though. Wish it had worked! 
 Polarity: Negative
Answer:
True