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: Caressa Women's Fisher Clog
Product feature: 100% Leather, Synthetic sole, Heel measures approximately 23.5", Platform measures approximately 0.75", Flexible sole, Package Dimensions: 12 x 8 x 4 inches, Shipping Weight: 2 pounds, ASIN: B004WMCWSA, Item model number: FISHER, Date first listed on Amazon: September 6, 2011, Domestic Shipping: Item can be shipped within U.S., International Shipping: This item is not eligible for international shipping. Learn More, Average Customer Review: 4.5 out of 5 stars 6 customer reviews
Product brand: Caressa
Target attributes: Silhouette
Answer: attribute: silhouette
value: clog
source: product title