Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Moen 22868 Excalibur 3 Hole Stainless Steel 22 Gauge Single Bowl Drop In Sink, Stainless
Product description: This item falls within our lowest price guarantee!, The Excalibur line of Moen stainless steel sinks offers sturdy functionality at an affordable price. Moen is dedicated to designing and delivering beautiful products that last a lifetime. Moen offers a diverse selection of kitchen faucets, kitchen sinks, bathroom faucets and accessories, and showering products. Moen products combine style and functionality with durability for a lifetime of customer satisfaction.
Product feature: Stainless finish delivers a lightly brushed warm grey metallic look, 25-Inch x 22-Inch overall dimensions, Bowl size 21.25-Inch x 16-Inch x 8-Inch, Fully undercoated for sound deadening and condensation control, 5 year limited warranty
Product brand: Moen
Target attributes: Number of Bowls
Answer: attribute: number of bowls
value: single bowl
source: product title