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: LG 60LB6000 60-Inch 1080P 120HZ TV
Product description: FULL hd
Product feature: 1080p Full HD Resolution, Motion Clarity Index 480, 2 HDMI, 1 USB, 1 Composite, 1 Component
Product brand: LG
Target attributes: Screen Form
Answer: attribute: screen form
value: None
source: None