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: Siggi's, Yogurt Strawberry Rhubarb, 4.4 Ounce
Product description: Delicious yogurt products with not a lot of sugar and simple ingredients. Our products are based on Scandinavian dairy traditions, such as skyr, the traditional Icelandic yogurt. Our products dont contain any of those dreadful artificial sweeteners. We only use milk from farmers who do not use growth hormones such as rBGH. Gluten Free, 4 Percent Milk Fat, 'PASTEURIZED WHOLE MILK, PASTEURIZED CREAM, FRUIT (RHUBARB, STRAWBERRIES), CANE SUGAR, FRUIT PECTIN, LIVE ACTIVE CULTURES', 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 brand: Siggis
Target attributes: Flavored / Plain
Answer: attribute: flavored / plain
value: strawberries
source: product description
attribute: flavored / plain
value: strawberry
source: product title