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: Carriage Boutique Girls Hand Smocked Dress (Baby) Red Polka Dot - Summer Dress
Product description: Pretty and playful dress for baby girls. This soft cotton dress has a Bishop collar and puffed sleeves. Beautiful Hand Smocking on the Bishop Collar and a fun Red Polka dot print. Back button closure to assist with dressing. 100% cotton. Machine Washable.
Product feature: 100% Cotton, Machine Washable, Handmade - Hand Smocked Bishop Collar, Bishop Collar, Easter Dress, Package Dimensions: 9.4 x 7.8 x 2 inches, Shipping Weight: 5.6 ounces, ASIN: B00V56CASS, Item model number: 82028-24M, Date first listed on Amazon: March 24, 2015, Average Customer Review: 5.0 out of 5 stars 1 customer review
Product brand: Carriage Boutique
Target attributes: Pattern
Answer: attribute: pattern
value: polka dot
source: product title
attribute: pattern
value: polka dot
source: product description