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: Company 81 Men's Short Sleeve End On End Slub V-Neck
Product feature: 100% Cotton, Machine Wash, Yarn dyed end on end fashion slub, Shoulder panels, Package Dimensions: 11 x 7.2 x 3.6 inches, Shipping Weight: 0.32 ounces, ASIN: B00CBVCEP0, Item model number: C33SK81, Date first listed on Amazon: August 26, 2013, Domestic Shipping: Item can be shipped within U.S., International Shipping: This item is not eligible for international shipping. Learn More, Average Customer Review: 3.0 out of 5 stars 2 customer reviews
Target attributes: Neckline
Answer: attribute: neckline
value: v-neck
source: product title