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: Fruit of the Loom Men's Boxer Briefs 8 Pack, Black & Grey-XX-Large
Product feature: Package Dimensions: 11 x 9.6 x 3.3 inches, Shipping Weight: 2.1 pounds ( View shipping rates and policies ), ASIN: B00L4M2790, Date first listed on Amazon: February 19, 2015, Average Customer Review: 5.0 out of 5 stars 1 customer review
Product price: $39.99
Target attributes: Silhouette
Answer: attribute: silhouette
value: boxer briefs
source: product title