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: Mario Balotelli Poster On Silk <96cm x 60cm, 38inch x 24inch> - C76A85
Product description: It's high quality art print produced on the Silk Fabric
Product feature: Size Approximately 96cm x 60cm, 38inch x 24inch, It's high quality art print produced on the Silk Fabric, It's perfect for a Unique Gift!, Fast and Safe Shipping, Wrapped and Sealed in a hard cardboard tube.
Product brand: HerculesPoster
Target attributes: Print Medium
Answer: attribute: print medium
value: None
source: None