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

Input:
Product title: Oklahoma State Charms Antique Silver Tone - 8 Charms
Product feature: Size: 23mm x 15mm x 1mm, 8 pcs per order, Made from zinc alloy metal (lead & nickel free), Ideal for pendants, earrings, zipper pulls, bookmarks, key chains, charm bracelets..., Ship with tracking number
Product brand: Unknown
Target attributes: Birth Month
Answer: attribute: birth month
value: None
source: None