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: Mcdonalds McCafe Premium Medium Roast Coffee Tassimo
Product description: Medium Dark Roast Coffee, 116 Grams/4.1 Ounces, Mcdonalds McCafe Premium Medium Roast Coffee Tassimo., 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: $20.89
Product brand: Mcdonalds McCafe
Target attributes: Roast
Answer: attribute: roast
value: medium roast
source: product description
attribute: roast
value: medium roast
source: product title