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:
This was one of the best lens purchases I've ever made. I've won contests using this lens. Probably the best kept secret of the Nikon Photography world. Awesome lens.

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