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

Input:
This lens is perfect for portraits because the 1.8 aperture lets in a lot of light.  It's a very versatile lens at 50mm, which makes this the perfect lens to take out on adventures when you don't want to lug around a bag full of accessories.

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