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: Pringle Women's 3 Pair Scarlette Spots and Plain Cotton Socks
Product description: A pretty burst of colour and pattern for your ankles! This triple pack of Pringle Scarlette Spots and Plain Cotton Socks has a pair of classic single colour polka dots, a contrasting plain pair, given a pop of colour with Pringle detail embroidery and tipping at the cuff, and the pack is completed by a larger, multicolour polka dot pair with contrast heels and toes. Each pair of socks in this Pringle triple pack is cotton rich, beautifully made with pretty scallop edged elasticated cuffs and comfortable hand linked toes for smooth seams. Are you a 'Scarlette' lady?(04/14)
Product feature: 3 Pair Pack, Scallop detail cuffs, Hand linked toes for smooth seams, Machine washable at 40, Please note: sizes are U.S. Sizes., ASIN: B00JKMWFLQ, Date first listed on Amazon: April 16, 2014, Average Customer Review: 5.0 out of 5 stars 1 customer review
Product brand: Pringle
Target attributes: Pattern
Answer: attribute: pattern
value: polka dot
source: product description