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: Mars Petcare Us 25083 Cat Food, Alaskan King Crab, 3.5-Oz. Cat Food
Product description: MARS PETCARE US INC CAT FOOD Whiskas, 3.5 OZ, Alaskan King Crab Cat Food, Flex Tray/Tub. Cat Food Seared Ahi Tuna Flavor in Meaty Juices. If your cat has fine taste when it comes to seafood. Then this recipe is purr-fect! From tray to the tropics. This Ahi tuna flavor is sure to please. Ingredients: sufficient water for processing, meat by-products, poultry by-products, liver, tuna, natural flavors, calcium carbonate, sodium tripolyphosphate, xanthan gum, carrageenan, dried yam, potassium chloride, l-cysteine, guar gum, salt, erythorbic acid, taurine, titanium dioxide, choline chloride, vitamin e & d3 supplements, iron oxide, natural seared ahi tuna flavor, zinc sulfate, ferrous sulfate, thiamine mononitrate (vitamin b1), sodium nitrite (for color retention), manganese sulfate, pyridoxine hydrochloride (vitamin b6), folic acid, menadione sodium bisulfite complex (source of vitamin k activity).
Product feature: Whiskas, 3.5 OZ, Alaskan King Crab Cat Food, Flex Tray/Tub., Cat Food Seared Ahi Tuna Flavor in Meaty Juices., If your cat has fine taste when it comes to seafood., Then this recipe is purr-fect! From tray to the tropics., This Ahi tuna flavor is sure to please.
Product brand: Whiskas
Target attributes: Life Stage
Answer: attribute: life stage
value: None
source: None