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: Gilbert Stuart, George Washington Lansdowne Portrait, 1796 Canvas Art Wall Picture, Museum Wrapped with Black Sides, 12 x 20 inches
Product description: Gilbert Stuart, George Washington Lansdowne Portrait, 1796 Canvas Art Wall Picture, Museum Wrapped with Black Sides and sold by Great Art Now, size 12x20 inches. This canvas artwork is popular in our People Art, Political Leader Art, Realism Art, Figurative Art, Portraits, US President Art, George Washington Art, and Famous Portraits categories. Great Art Now was started in 2002 by a group of friends with an interest in both art and technology. That interest and a lot of hard work has led us to become one of the largest online retailers in the country. We use our buying power to create great art that can be sold at great prices and is accessible to everyone. All of our artwork is stored in our New Jersey warehouse and our finished pieces are handcrafted for you by our expert craftsman. 1. Package arrives with Gilbert Stuart, George Washington Lansdowne Portrait, 1796 Canvas Art Wall Picture 2. Satisfaction Guarantee 3. Easy to hang with your own drywall screw 4. UVA protective coating will help protect artwork for years to come.
Product feature: Print Title: Gilbert Stuart, George Washington Lansdowne Portrait, 1796, Finished Size: 12x20 inches, Bar Depth: 1.5 in., UVA Protective Coating - Preserves Color and Quality, Hangs Easily with Standard Drywall Screw (not included), Satisfaction Guaranteed - 30 Day, No Questions Asked Return Policy
Product price: $86.62
Product brand: Great Art Now
Target attributes: Paint Medium
Answer: attribute: paint medium
value: None
source: None