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: Foster Grant POLARIZED Sunglasses (81) 100% UVA & UVB Protection-Shatter Resistant
Product feature: Polarized, ASIN: B00CYT3T7G, Date first listed on Amazon: May 15, 2016, Average Customer Review: 1.0 out of 5 stars 1 customer review
Product brand: Foster Grant
Target attributes: Silhouette
Answer: attribute: silhouette
value: None
source: None