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: 24x36 Poster; Vought F4U-4 Corsair Uss Philippine Sea (Cv-47) Korean War
Product feature: 24" x 36" poster, Printed on museum-quality photo paper using archival ink rated for 80+ year fade resistance, Shipped in mailing tube to prevent bending
Product price: $43.95
Product brand: Welsh Printing
Target attributes: Print Medium
Answer: attribute: print medium
value: None
source: None