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

Input:
<a data-hook="product-link-linked" class="a-link-normal" href="/Thermos-Nissan-14-Ounce-Leak-Proof-Insulated-Travel-Mug/dp/B00004WHWV/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Thermos Nissan 14-Ounce Leak-Proof Insulated Travel Mug</a>

I am very happy with my Thermos Nissan. It doesn't leak when knocked over and keeps liquid hot/cold for hours.

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