Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: New! Skinny Girl "Americano Coffee" 24 Count Keurig 2.0 Compatible Coffee K Cups!
Product description: Inspired by the espresso-based drink, this coffee house favorite offers a little kick with big, bold dark roast flavors and full body. Just brew and enjoy. We are filled with ideas to help you celebrate the things you love. From crafting the perfect cup of your favorite beverage with premium ingredients, to finding a new flavor twist that is sure to please, Statements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition.
Product price: $18.99
Product brand: Skinnygirl
Target attributes: Roast
Answer: attribute: roast
value: dark roast
source: product description