Instruction: Using the product's title, description, features, price, and brand, identify and retrieve the values associated with a specified set of target attributes. Output the extracted values along with their respective sources (e.g., title or feature) indicating where each value was found.

Input:
Product title: Akai PDP4273M 42" Plasma HDTV
Product description: 42" High Definition, High Luminance, Plasma Display monitor
Product feature: 1024 X 1024 native resolution for HDTV performance producing sharper image., Beautiful color depth with a contrast ratio of 3000:1, High Luminance Plasma Display for brighter picture, Wide Viewing Angle (160 degrees) makes for many installation configurations., Versatile unit with inputs for all your av equipment, including VGA for PC.
Product brand: Akai
Target attributes: Refresh Rate
Answer: attribute: refresh rate
value: None
source: None