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: 2 Pairs of Silvertone with Green Iced Out Butterfly Stud Earrings (R-3501)
Product description: This is a pair of great quality stud earrings. This is fashion jewelry designed to last!
Product feature: THIS PRICE IS FOR TWO PAIRS OF EARRINGS!, These earrings measures 1.25 inches from left to right and 1 inch from top to bottom., Great Quality Jewelry!, Ships from USA, Guaranteed!, Package Dimensions: 9 x 6 x 3 inches, ASIN: B00EO6OF7U, Item model number: YE1068"/"R-3501, Date first listed on Amazon: August 20, 2013, Average Customer Review: 2.0 out of 5 stars 1 customer review
Product brand: JOTW
Target attributes: Silhouette
Answer: attribute: silhouette
value: stud
source: product description
attribute: silhouette
value: stud
source: product title