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

Input:
WELL I CANT REALLY TELL IF IT WORKS OR IT DONESN'T , I'VE  ONLY  BEEN USING IT FOR A WEEK AND A HALF NOW, IT DOES GIVE A LOT OF BACK PAIN AND I THINK MY BEST ADVICE WOULD BE TO COUNSULT YOUR DOCTOR IF IT'S OK BEFORE YOU USE IT BECAUSE IT ALSO STATES THAT IN THE INSTRUCTION.

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