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

Input:
While in PT for my total knee replacement, this is the strap used.  I bought one for myself, as I was also doing PT here at home.  It has been very helpful, and just what I needed to do the therapy to strengthen my knee.

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