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: Aeropostale Boys Psny Stacked Graphic T-Shirt
Product description: Gender: Boys Country of Manufacture: Honduras Collar Style: Crew Neck Season: All Seasons Density: Light Weight Sleeve Length: Short Sleeve Occasion: Casual Additional Details: Stacked puff paint logo Crew neck Short sleeves
Product feature: 100% Cotton, Collection: P.S. Aeropostale Kids - Style 5859, MSRP - $17.50 / T-Shirt, Graphic Tee, Light Weight, Shipping Information: View shipping rates and policies, ASIN: B00IYZ76DC, Item model number: 5859, Date first listed on Amazon: March 12, 2014, Average Customer Review: 5.0 out of 5 stars 1 customer review
Product price: $9.45
Target attributes: Neckline
Answer: attribute: neckline
value: crew neck
source: product description