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: GE Profile PT9800SHSS 30" Built-in Combination Wall Oven in Stainless Steel
Product description: Profile Advantium 30" Stainless Steel Electric Combination Wall Oven - Convection - Speed Oven
Product feature: 5.0 Cu. Ft. Capacity Convection Oven & 1.7 Cu. Ft. Microwave, True European Convection W/ Third Heating Element & Fan, 1000 Watt Upper Microwave Oven, Oven 175 Preprogrammed Microwave Menu Selections
Product price: $479.86
Product brand: GE
Target attributes: Power Source
Answer: attribute: power source
value: electric
source: product description