Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: Doi Chaang Coffee Single Estate Whole Bean Coffee, Dark Roast, 1 Pound
Product description: We give our Doi Chaang premium beans a long slow roast to create a dark, exotic cup with an intensely bold richness. Vibrant with an earthy fragrance, our single-estate dark roast has a heavy body with a pleasant, slightly tart acidity., Whole Bean Coffee - 100% Aribica, Organic, 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 brand: DOI CHAANG COFFEE
Target attributes: Roast
Answer: attribute: roast
value: dark roast
source: product description
attribute: roast
value: dark roast
source: product title