Instruction: Given the user's review, identify the user's sentiment from the listed options. Answer using one of the options.

Input:
I have used this product as part of rehab with a total knee replacement. The product is of excellent quality and has many uses besides helping with knee rehab. I highly recommend it.

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