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: Tweety Bird 27" Balloon
Product description: Looney Tunes Tweety 27" Super Shape Balloon
Product feature: Quantity-1, Size-27 Inches, Color-Multi-Color, Material-Metallic, Imprintable-No
Product brand: Fun To Collect
Target attributes: Theme
Answer: attribute: theme
value: None
source: None