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:
I orginally purchased this mouse for work as I thought I was suffering from carpel tunnel as I had wrist pain from moving the mouse on the mouse pad.  I choose this model as it makes your thumb vs your wrist to all of the work.  After a day of getting use to moving the trackball instead of the entire mouse I have loved it ever since, probably about 5 yrs now.  I still have the original mouse that I still use to this day at work and now am purchasing one for home use.  I will warn any owner of this mouse that as soon as there is the slightest lag in your dragging it's time to change the batteries, the batteries last pretty long also as I don't think I change them out more than 3x a year and that is will 5 days a week 10 hr a day usage. It's totally worth the retraining of your hand and thumb, plus an added bonus is that no one will use your computer if you have this mouse as people cannot figure it out right away.

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