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: Rhodium Plate Silver Blue Drusy and Cz Lever Back Drop Earring
Product description: Sterling Silver Rhodium Plate Blue Drusy Drop Earring with White CZ Frame
Product feature: Free Super Saver Shipping On All U.S Orders!, Top Rated Seller - 100% Satisfaction Guarantee - Fast Shipping - Easy Returns, Cheline has Been Desining Jewelry for 25 Years, Ships in a Gift Box with Its Own Pretty Jewelry Pouch, Mark .925 Sterling Silver, Shipping Information: View shipping rates and policies, ASIN: B008Y4JRXU, Item model number: E0722WPSADBCZ, Discontinued by manufacturer: Yes, Date first listed on Amazon: August 15, 2012, Average Customer Review: 4.4 out of 5 stars 2 customer reviews
Product price: $79.00
Product brand: CHELINE
Target attributes: Silhouette
Answer: attribute: silhouette
value: lever back
source: product title
attribute: silhouette
value: drop
source: product description