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

Input:
Have used the Nissan Thermos daily for several years.  Great value.  Tough construction, consistently leak proof.  If you are tough on a thermos, this thermos is for you!

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