Instruction: Determine the sentiment expressed by the user in her review from the provided choices, and respond by selecting one of the available options.

Input:
Perfect little air mattress. My only gripe would be how difficult it is to deflate, but that's a good thing in the case of it not going flat on you. I just have to pack something to stick into the valve when I want to deflate it.

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