Instruction: Using the product's title, description, features, price, and brand, identify and retrieve the values associated with a specified set of target attributes. Output the extracted values along with their respective sources (e.g., title or feature) indicating where each value was found.

Input:
Product title: Down Syndrome Awareness Makes Me Proud Ladies V-Neck T-Shirt aqua XL
Product feature: ASIN: B01CDOM18O, Date first listed on Amazon: April 17, 2016, Average Customer Review: 4.0 out of 5 stars 1 customer review
Product brand: TeeShirtPalace
Target attributes: Neckline
Answer: attribute: neckline
value: v-neck
source: product title