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: Corelle Modern Lines Dinner Plate, Pack of 6
Product description: Corelle Modern Lines Dinner Plate, Pack of 6
Product feature: Includes (6) 10-1/4" Dinner Plates., Made with break and scratch resistant patented Vitrelle glass technology., Space saving design: lightweight and thin, yet extremely durable., Microwave, dishwasher, and oven safe- patterns won't wash, wear, or scratch off., Vitrelle Glass Dinnerware is made in the USA and comes with a 3 Year Warranty.
Product brand: Corelle
Target attributes: Quantity
Answer: attribute: quantity
value: pack of 6
source: product description
attribute: quantity
value: pack of 6
source: product title