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: Nikon D2H Pro Digital SLR Camera (Body Only)
Product description: 2/8/200615-19-32. Nikon
Product feature: 4.1-megapixel sensor captures detail to create 12-by-15-inch photo-quality prints, Compatible with AF Nikkor lenses, Continuous shooting mode; 11-sensor autofocus, Store photos on CompactFlash (CF) memory cards (sold separately), Powered by EN-EL4 rechargeable Lithium-ion battery (included with charger)
Product price: $159.99
Product brand: Nikom
Target attributes: Optical Zoom
Answer: attribute: optical zoom
value: None
source: None