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: Mephisto Women's Veneta Pump
Product description: Mephisto makes some of the finest walking shoes on earth. Their comfort, support and durability are recognized wherever people are serious about walking. For more than three decades, Mephisto has been on the forefront of walking-shoe innovation. Mephistos natural products are handmade of leather, latex, cork and rubber.
Product feature: 100% Leather, Imported, Rubber sole, Package Dimensions: 11.9 x 7 x 4.4 inches, Shipping Weight: 2 pounds, ASIN: B00BM9ZFN0, Item model number: Veneta, Date first listed on Amazon: August 29, 2013, Domestic Shipping: Item can be shipped within U.S., International Shipping: This item is not eligible for international shipping. Learn More, Average Customer Review: 4.2 out of 5 stars 10 customer reviews
Product brand: Mephisto
Target attributes: Silhouette
Answer: attribute: silhouette
value: pump
source: product title