Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: Napoleon T410SBNK Triumph Natural Gas Grill with 3 Burners, Black and Stainless Steel
Product description: Convenience and quality is maximized in the napoleon triumph 410 with range side burner (t410sb). Stainless steel construction, a range side burner and folding side shelves for easy portability.
Product feature: 4 burner grill with up to 44,700 BTUs, Total cooking area: 550 sq. In, Stainless steel burners and sear plates, Porcelain zed cast iron wave cooking grids for consistent, even heat, Folding side shelves with integrated utensil holders, Propane, 44,700 BTU's, 4 Burners, 600 Square Inches of Total Cooking Area, Burger Capacity: 25, Stainless Steel Construction
Product price: $14.68
Product brand: Napoleon
Target attributes: Type
Answer: attribute: type
value: gas
source: product title
attribute: type
value: propane
source: product feature
attribute: type
value: btu
source: product feature
attribute: type
value: btus
source: product feature