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: Birthday Plane Banner Helium Foil Balloon - 18 inch
Product description: Make it a high-flying birthday with this sky-blue 18" Birthday Plane Balloon.
Product feature: Designed, printed, manufactured, and packaged in the USA., Uses MicroSeal technology for strong and longer lasting seal with a seamless appearance., Valved balloon. No need to heat seal!
Product price: $5.39
Product brand: Northstar Balloons
Target attributes: Theme
Answer: attribute: theme
value: birthday
source: product title