Task: Sentiment_Analysis

system
You are a helpful assistant. The assistant first thinks about the reasoning process in the mind by using Belief-Desire-Intention (BDI) framework and then provides the user with the answer. The reasoning process and answer are enclosed within <think> </think> and <answer> </answer> tags, respectively. 
Below is an instruction that describes a task. After thinking, when you finally reach a conclusion based on the customer's intention, desire and belief, clearly state the BDI thinking process within <think> </think> and then the answer within <answer> </answer> tags.


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

Input:
User Review: Had I written this review a month or two after we got this blender, I'd be pretty content with it.  After 8-10 months I'm quite unhappy with this blender.

We bought it to make soy milk and frozen fruit shakes for breakfast.  This means pretty much daily use chopping up frozen fruit for 2 shakes.  I realize that frozen fruit is pretty tough on a blender.  Clearly tougher on this blender than on previous, significantly cheaper blender that we've had.  It took may 6 months before the nut that held the blades in came loose.  We took it to an authorized Waring repair place and after 4 weeks, they replaced the blade assembly.  The unit seemed to work fine for another month.

Then the nut that holds the shaft in place came loose.  This is kind of the plug in the hole at the bottom of the blender so all the contents leaked out.  I wasn't going to wait another 4 weeks for "repairs" again.  I pulled out my long socket wrenches and took the pieces apart (the blade nut and the nut that held the shaft/plug in) and cleaned them.  I noticed that the hole where the assembly went through at the bottom of the blender seemed sort of chipped.  When I carefully wiped around the hole to get it clean before I put all the parts back, it seemed to flake off a few more glass chips.  I reattached the shaft with all the rubber seals and put the capnut back on the blade assembly.  Once again, the unit worked fine -- for a few more days.

Then the shaft at the bottom came loose again, spewing blender contents out the bottom.  I thought it wasn't wide open and I needed to eat breakfast that morning so I thought I'd just clean up after it with the small amount of liquid leaking out.  When I had a couple of swigs of my shake I noticed that there were some really gritty bits in there.  I thought nothing of it, but as I had more, I got suspicious.  I took the unit apart again to try to retighten the shaft at the bottom.  Again, I seemed to feel little glass chips down there and now I was kind of freaked out that I'd just swallowed some glass chips.  Poured the rest of the shake out, cleaned the blender yet again and reassembled it.

The hole at the bottom of the blender where the chips were is covered by the rubber seals so if the nuts stay tight and stay in place, there shouldn't be a danger, but I'm totally nervous about this thing now.  Particularly if I'd have to reattach/retighten the nuts every week or so.

I have to admit that at one point I thought having a glass container was a good thing.  Now I think that at least if something happened to make the container come apart, I'm inadvertently swallowing plastic rather than glass.

No, I haven't overtightened the nuts on the blender.  I'm trying really hard to go easy on this thing and add the frozen fruit slowly, but it doesn't seem to matter.  This thing is probably great to make soft/easy things with, but for frozen fruit, even Waring says it could make things come loose.

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


assistant
Answer: D: negative