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: KAS Oriental Rugs Catalina Collection Calla Lilies Round Area Rug, 5' x 6", Black
Product description: KAS Rugs Catalina 0759 Black Calla Lilies 5'6" Round Area Rug. Hand-Tufted, 100% Wool, Cotton Backing. Made in China.
Product feature: 5'6" Round in size, Hand-Tufted, One hundred percent Wool, Cotton Backing
Product brand: Kas Rugs
Target attributes: Shape
Answer: attribute: shape
value: round
source: product description
attribute: shape
value: round
source: product title
attribute: shape
value: round
source: product feature