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: King Size White 500 Thread Count 100% Cotton Sateen Dobby Stripe Sheet Set
Product description: Each set contains a flat sheet, a fitted sheet that will fit a mattress up to 15" and two pillowcases. Machine wash, gentle cycle. Tumble dry low. Available in Queen size, and King size. Beige, Coffee, Light Blue, Sage, Silver,and White. LUXURIOUS QUEEN SIZE SHEET SET DOBBY STRIPE 500 THREAD COUNT 100% cotton sateen DEEP POCKETS SHEET SET CONTAINS; 1 QUEEN FLAT SHEET 1 QUEEN FITTED SHEET 2 STANDARD PILLOW CASES SELLS IN STORES FOR $99.99 SOFTEST SHEET SET YOU WILL EVER SLEEP ON!! MACHINE WASHABLE, DEEP POCKETS FITS UP TO 15 INCH MATTRESS, NO IRONING NEEDED!!!!!!!!! Heavy Weight 100% Cotton Sateen Sheet Set Deep Pocket!!! Wrinkle Free Dobby Stripe Sheet Set!!! fits mattresses up to 15" Elastic all around for a perfect fit Machine wash, gentle cycle. Tumble dry low
Product feature: 100% cotton, Luxurious heavyweight cotton sateen, Deep Pockets for up to 15 inch Mattresses, Wrinkle Free (No Iron) Sheet Set, 500 thread count, low price
Product price: $19.99
Product brand: Ruthie's Textile
Target attributes: Thread Count
Answer: attribute: thread count
value: 500 thread count
source: product title
attribute: thread count
value: 500 thread count
source: product feature
attribute: thread count
value: 500 thread count
source: product description