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: Lenovo E73 10AS002JUS (Discontinued by Manufacturer)
Product description: Lenovo E73 10AS002JUS Core i3 4130 4th Gen 4GB (1 DIMM) 500GB / 7200RPM W7P64 preload w/ W8P64 RDVD, License 1 Yr Onsite No Desktop
Product feature: Intel Core i3 3.2 GHz Processor 3.4 GHz( cache), 4GB DDR3, 500 GB 7200 rpm Hard Drive, Windows 8
Product brand: Lenovo
Target attributes: Processor Brand
Answer: attribute: processor brand
value: core i3
source: product description
attribute: processor brand
value: intel core i3
source: product feature