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: Laura Ashley, Caroline Collection, 100-Percent Cotton Sheet Set, Twin
Product description: Laura Ashley Caroline is a beautiful floral print featuring yellow and blue accented with and ticking stripes. The Sheet sets are 100-percent cotton percale 300 thread count. The Comforter set includes the Comforter, Shams and bedskirt. Complete the ensemble with designer accessories including drapes, euro shams and decorative pillows.
Product feature: flat sheet 66 by 96 inches, fitted sheet 39 by 75 inches, 300-Thread count matte weave, 14-Inch pocket, fits up to 18-inch mattress, Small floral print with contrast hem, Soft, luxurious hand
Product brand: Laura Ashley
Target attributes: Thread Count
Answer: attribute: thread count
value: 300 thread count
source: product description
attribute: thread count
value: 300-thread count
source: product feature