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: Stash Chai Spice Black Tea (Box of 30)
Product description: Single bag in sealed packet. Case of 30 packets., Single tea bag in sealed packet. 100% natural ingredients. Ingredients: Blended black teas, ginger, cinnamon, allspice, nutmeg, clove and natural flavors of cinnamon, clove and cardamon., 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: $9.99
Product brand: Stash Tea
Target attributes: Form
Answer: attribute: form
value: bag
source: product description