Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: Getac VWR122 V110 Convertible 11.6in Display, Intel I5-4300u 1.9ghz Processor, 3mb Cach
Product description: Getac Vwr122 Getac V110 Convertible 11.6In Display, Intel I5-4300U 1.9Ghz Processor, 3Mb Cach
Product feature: A quality product by GETAC, A quality product by GETAC, A quality product by GETAC, A quality product by GETAC, A quality product by GETAC
Product brand: Getac
Target attributes: Number of Cores
Answer: attribute: number of cores
value: None
source: None