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

Input:
Product title: I'M YOUR HUCKLEBERRY DOC 3X Men's Tee (6.1oz)
Product feature: ASIN: B00GC6UUUG, Date first listed on Amazon: February 26, 2016, Average Customer Review: 5.0 out of 5 stars 1 customer review
Product brand: AM T-Shirts
Target attributes: Neckline
Answer: attribute: neckline
value: None
source: None