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: EASOS GEAL OPRV-37 Women's Glitttering Studded Lace-up Flat Oxford, Color:WHITE, Size:7
Product feature: Package Dimensions: 11.9 x 7.2 x 4.1 inches, Shipping Weight: 1.25 pounds, ASIN: B00LBZVF98, Item model number: OPRV-37, Date first listed on Amazon: September 16, 2014, Average Customer Review: 5.0 out of 5 stars 1 customer review
Product brand: Easos Geal
Target attributes: Silhouette
Answer: attribute: silhouette
value: oxford
source: product title