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: AC Power Adapter model 57-30-500D 11P0100 for Lexmark Color Printer
Product description: This is a generic AC Adapter compatible with most Lexmark printers using a black female adapter plug. (black tipped)
Product feature: Class 2 Power Supply for lexmark Printer, INPUT: 120-127V AC 60HZ 0.22A, OutPut: 302V DC 500mA, AC Adapter
Product price: $29.50
Product brand: Lexmark
Target attributes: Type
Answer: attribute: type
value: ac power adapter
source: product title
attribute: type
value: ac adapter
source: product feature
attribute: type
value: ac adapter
source: product description
attribute: type
value: power supply
source: product feature