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: Doublju Womens Short Sleeve V-neck Basic Comfy Casual T-Shirts-Medium-CWTTS069_Royalblue
Product feature: Package Dimensions: 15.6 x 12.2 x 2.1 inches, Shipping Weight: 8.8 ounces, ASIN: B017D1XB5Y, Item model number: CWTTS069-ROYALBLUE-M, Date first listed on Amazon: April 15, 2016, Average Customer Review: 5.0 out of 5 stars 1 customer review
Target attributes: Neckline
Answer: attribute: neckline
value: v-neck
source: product title