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: Le Creuset Enameled Cast-Iron 5-1/2-Quart Round French Oven, Kiwi
Product description: Le Creuset 5 1/2 Qt Round French Oven, Kiwi The hand-finished craftsmanship and superior quality of Le Creuset enameled cast iron have long made it the cookware considered by many to be the finest in the world. Bold colors, timeless design and its singular performance - from oven to stovetop to table - make it a welcome part of any kitchen. Extremely heat efficient and works on any cooking surface., This 5-1/2-quart French oven by Le Creuset is the most forgiving pan I've ever used. If you just happen to forget you're sauteing onions for a soup while you answer the telephone, there's no need to worry--the onions won't burn. Enameled cast iron has been recognized as one of the best materials available for cookware because it retains heat and promotes gentle, even cooking at low heat ensuring that the best flavor is brought out from the ingredients. It's perfect for use on any heat source--gas, electric, radiant, ceramic, halogen, induction, or solid fuel. There's also a tight-fitting, enameled cast-iron lid that helps seal in heat and flavor. Food will be kept hot as you bring it to the table for serving. And you will certainly want to serve out of this beautiful piece--the color and shiny finish will brighten any table setting. The French oven measures 10-1/2 by 4-1/2 inches and carries a lifetime warranty. --Jane DePaolo
Product feature: 5-1/2-quart round-shaped French oven made of enameled cast iron, Cast-iron loop side handles; black, phenolic, stay-cool lid knob, Heavy, tight-fitting lid helps lock in heat, moisture, and flavor, Washing by hand recommended; oven-safe to 350 degrees F, Measures 10-1/5 by 10-1/5 by 4-1/2 inches; limited lifetime warranty
Product brand: Le Creuset
Target attributes: Material
Answer: attribute: material
value: cast iron
source: product feature
attribute: material
value: cast-iron
source: product title
attribute: material
value: cast-iron
source: product description
attribute: material
value: cast iron
source: product description
attribute: material
value: cast-iron
source: product feature