Instruction: Assess the user's sentiment in the provided review and select the appropriate sentiment option from the list as the answer.

Input:
Long valve stem facilitates replacement of the bladder.  I think this is better than the original vinyl bladder.  It does need to be reinflated every now and then.

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