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: Guerrero White Corn Tortillas, 18 Count
Product description: We use high-quality ingredients and time-tested techniques to make sure every package of Guerrero White Corn Tortillas are an authentic addition to your family's dinner table. Our tortillas have a soft texture and traditional flavor that enhances any recipe, from Mexican dishes passed down through the generations to any modern twist you can come up with. Guerrero White Corn Tortillas are also gluten-free and don't contain any lard, trans fat, or cholesterol. We recommend loading our corn tortillas with homemade carne guisada topped with avocado and cotija cheese. Includes one 18-count package of Guerrero White Corn Tortillas., 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: Guerrero
Target attributes: Tortilla Type
Answer: attribute: tortilla type
value: corn
source: product title
attribute: tortilla type
value: corn
source: product description