Task: Sentiment_Analysis
Instruction: Determine the sentiment expressed by the user in her review from the provided choices, and respond by selecting one of the available options.

Input:
My old mouse gave out, probably due to all the gunk that had built up on the ball. I looked at several here on Amazon and was impressed with the reviews for this one. The price is awesome and the mouse works like a dream. There is no choppy movement like you get with a ball mouse, and best of all you won't have to clean out the gunk. I use this mouse with my iMac and my iBook and couldn't be any happier with its performance. The positive reviews speak for themselves...this mouse is a must have.

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