Task: Sentiment_Analysis
Instruction: Carefully assess the user's review for any strong expressions of sentiment, either positive or negative. Based on your analysis, select the most fitting sentiment option from the provided list as output.

Input:
While I don't use any of the buttons except for the bottom two (which are the typical right/left buttons on a mouse), I find this mouse to be extremely useful. First, it's a trackball mouse. I personally find regular mice to be hard on my wrists (and somewhat annoying over time as the mouse become less sensitive.) Second, this mouse can be adjusted so that it is not only extremely sensitive, but also useable. Although every mouse can be set so the cursor flies across the screen, this mouse can be finely set so that you not only have an extremely fast mouse, but also one that is manageable in terms of stopping the cursor. All in all, I find this to be the most functional mouse (in terms of speed and positioning of the cursor) that I have ever used. The biggest downside is that it is quite large.

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: A: very positive