Correct option is B
The odd one out is Milk Dairy because it is the only pair consisting of two individual words rather than a compound term or an integrated entity.
However, Milk Dairy represents a category or a place and doesn't fit as a food item.
- Chocolate Milk: A single compound term referring to a flavored beverage.
- Milkshake: A drink made with milk and other ingredients.
- Milk Cake: A dessert, also a compound term.