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: Contemporary Furniture White Leather Symmetrical Sectional Sofa
Product description: Dimensions: See Photo Above for complete layout dimensions
Product feature: White Leather Sectional includes 3 modular pieces: 2 extensions and 1 corner along with 3 pillows, Beautiful symmetrical sectional perfect for those tight fits in your living or family room, Legs are made of chrome plated stainless steel for years of carefree use and style, Entire seating area is leather, back and sides are leather-match material
Product brand: Modern Line Furniture
Target attributes: Material
Answer: attribute: material
value: leather
source: product title
attribute: material
value: leather
source: product feature