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: Japanese Shirakiku Nori Maki Arare Rice Crackers With Seaweed Snack 3oz (Pack of 2)
Product description: Japanese Shirakiku Nori Maki Arare Rice Crackers With Seaweed Snack, Statements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition.
Product price: $1.39
Product brand: Shirakiku
Target attributes: Variety
Answer: attribute: variety
value: rice
source: product title
attribute: variety
value: rice
source: product description