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: LXG, Inc. Purdue University - Twist Action Ballpoint Pen - Black
Product description: Our Purdue University Twist Action Ballpoint Pen is the perfect way to represent your school spirit in class or at the office. This pen is made with solid brass construction, has a rubberized grip, and the logo is laser etched to resist fading.
Product feature: Officially Licensed Collegiate Logo, Solid Brass Construction, Smooth Rubberized Grip, Ships in Black Gift Box
Product price: $13.95
Product brand: LXG, Inc.
Target attributes: Ink Color
Answer: attribute: ink color
value: black
source: product title
attribute: ink color
value: black
source: product feature