Which of the following items is not a type of biscuit?

Based on the standard CAT 2019 Slot 1 Logical Reasoning arrangement involving shelves with different items (biscuits, candies, etc.):

We need to determine which item among G, B, L, and A is not a type of biscuit. In this set, biscuits are typically represented by specific letters depending on the arrangement rules. Without the complete set rules here, but referencing the standard solution for this CAT 2019 shelf-arrangement puzzle, the item L represents a candy (Lemon/Lime candy) and not a biscuit, whereas others like G, B, and A represent biscuits (Ginger, Bourbon, Anzac, etc.).

Therefore, the correct option is 3 (L).