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: Mk Collection Gypsy Crushed Ruffle Sheer Curtains - 55" Width By 84" Inch Length (Black)
Product description: Elegant Crush Sheer Panel uses cascading layers of soft, crinkled voile to create an elaborate bouffant styled panel.
Product feature: 100% Polyester, Elegant Crush Sheer Panel uses cascading layers of soft, crinkled voile to create an elaborate bouffant styled panels, 1 panel measuring 58 X 84", 100% Polyester
Product price: $14.96
Product brand: MK Home
Target attributes: Light Allowance
Answer: attribute: light allowance
value: sheer
source: product feature
attribute: light allowance
value: sheer
source: product title
attribute: light allowance
value: sheer
source: product description