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: SKIDDERS The Original Womens Ballet Flat Jelly Shoes
Product feature: Plastic, Package Dimensions: 10.7 x 5.7 x 2.3 inches, Shipping Weight: 13.6 ounces, ASIN: B01GETN64C, Date first listed on Amazon: May 31, 2016, Average Customer Review: 3.0 out of 5 stars 2 customer reviews
Product brand: SKIDDERS
Target attributes: Silhouette
Answer: attribute: silhouette
value: ballet
source: product title