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: Puma Kids Big Boys Linear Tee
Product description: Boys essential short sleeve crewneck in lightweight cotton jersey decorated with bold linear graphics at the front. Ribbed neckline. PUMA cat logo at back.
Product feature: 100% cotton, Imported, Machine Washable, 100% Cotton, Product Dimensions: 8 x 10 x 1 inches, Shipping Weight: 4 ounces, ASIN: B00FME64NQ, Date first listed on Amazon: October 4, 2013, Average Customer Review: 4.7 out of 5 stars 3 customer reviews
Target attributes: Neckline
Answer: attribute: neckline
value: ribbed neckline
source: product description
attribute: neckline
value: crewneck
source: product description