Search Multiple Word String and Return Categories

Hello,

Completely lost on this one. I'm trying to parse through a string with multiple items, compare each against a list of categories, and return which categories are included in the string. I've included an example:

Categories:

Berries	Raspberries, Blueberries, Blackberries
Tropical Fruit	Star Fruit, Bananas
Everyday Fruit	Apples, Oranges

List:	Return:
Apples, Bananas, Raspberries	Everyday Fruit, Tropical Fruit, Berries
Star Fruit	Tropical Fruit
Blueberries	Berries
Oranges, Blackberries	Everyday Fruit, Berries