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: Thermos 4-Burner Gas Grill
Product description: This Thermos classic 48,000 BTU gas grill features a total of 685 square Inch of cooking surface with 4 stainless steel burners. With 48,000 BTU's on the main burners and a 10,000 BTU side burner, you can cook for a crowd. It features electronic ignition, porcelain cooking grate, porcelain swing-away wire rack and a built in temperature gauge. The full front panel and 8" wheels allow for easy, stable mobility. The value is obvious.
Product feature: Thermos 4 burner, 48,000 BTU gas grill with 10,000 BTU lidded side burner, 480 sq. in. of primary cooking on porcelain-coated cast iron grates plus 208 sq. in. of secondary cooking on porcelain-coated swingaway, Large, painted metal side shelves offer lots of workspace, Stainless steel insert lid adds style to this model, Electronic ignition system offers a reliable spark with every push
Product brand: Thermos
Target attributes: Type
Answer: attribute: type
value: gas
source: product feature
attribute: type
value: gas
source: product title
attribute: type
value: btu
source: product description
attribute: type
value: btu
source: product feature