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:
I have been struggling with tennis elbow for months. I came across this device in physical therapy. I have only been using it for a short while but it is really starting to make a difference.

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