Categorize the following items as a vegetable, animal or mineral.
Cow, Potato, Diamond
- Cow is an animal. 
- Potato is a vegetable. 
- Diamond is a mineral.
Complete the following task based on the instruction and optional input provided.### Instruction:
Categorize the following items as a vegetable, animal or mineral.

### Input:
Cow, Potato, Diamond

### Output:
- Cow is an animal. 
- Potato is a vegetable. 
- Diamond is a mineral.