Categorize the following sentence based on the four emotion categories: Joy, Fear, Anger, and Sadness.
I feel so frustrated and helpless.
Anger
Complete the following task based on the instruction and optional input provided.### Instruction:
Categorize the following sentence based on the four emotion categories: Joy, Fear, Anger, and Sadness.

### Input:
I feel so frustrated and helpless.

### Output:
Anger