Instruction: Using the product's title, description, features, price, and brand, identify and retrieve the values associated with a specified set of target attributes. Output the extracted values along with their respective sources (e.g., title or feature) indicating where each value was found.

Input:
Product title: Green Mountain Coffee Breakfast Blend, Keurig K-Cups, 144 Count
Product description: Fresh Coffee, 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: $78.97
Product brand: Green Mountain Coffee Roasters
Target attributes: Roast
Answer: attribute: roast
value: None
source: None