Task: Sentiment_Analysis
user: 

 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.  /nFor the BDI reasoning process, (1) Based on the User Review, starting with "customer believes", list the user's beliefs; then, based on the User Review and the definition of Reiss's 16 basic desires theory, list the user's desires; next, based on the listed beliefs, desires and User Review, starting with "customer intends", list the intentions; (2) Finally, based on the generated beliefs, desires and intentions, construct logically BDI reasoning process, and select the correct answer based on the BDI reasoning process and input. /nThe definition of Reiss's 16 Basic Desires Theory: 1. Acceptance - the need to be appreciated 2. Curiosity, the need to gain knowledge 3. Eating, the need for food 4. Family, the need to take care of one’s offspring 5. Honor, the need to be faithful to the customary values of an individual’s ethnic group, family or clan 6. Idealism, the need for social justice 7. Independence, the need to be distinct and self-reliant 8. Order, the need for prepared, established, and conventional environments 9. Physical activity, the need for work out of the body 10. Power, the need for control of will 11. Romance, the need for mating or sex 12. Saving, the need to accumulate something 13. Social contact, the need for relationship with others 14. Social status, the need for social significance 15. Tranquility, the need to be secure and protected 16. Vengeance, the need to strike back against another person/nNow the user gives an instruction that describes a task and ask you write a response that appropriately completes the request. After thinking, when you finally reach a conclusion, clearly state the BDI thinking process within <think> </think> firstly and then the answer (i.e., answer only letters in options) within <answer> </answer> tags.
Instruction: Analyze the user's review text and determine the overall sentiment expressed, then choose the corresponding sentiment option from the provided list (A: very positive, B: positive, C: neutral, D: negative, E: very negative) based on the identified sentiment.

Input:
User Review: The Contigo travel mug used to be my favorite travel mug.  It kept liquids hot for hours!  But the lid is a little difficult to clean and after about 4 months of constant use, one of the inner o-ring seals fell apart (someone else posted photos on the Contigo mug page with the same broken seal).  It is still usable, but does not seal as well as it used to and does leak slightly now.  So after much research for a new travel mug, I opted to try the Thermos 12oz w/tea infuser in stainless steel. Great product so far! You do have to make sure you get both covers (sippy cover and top seal) on correctly, but once you do that, it will keep your liquids hot or cold for hours with no leaks (I often carry mine in a tote bag).  It isn't quite as convenient as the Contigo mug because you have to unscrew the top seal to take a drink, but still worth the effort. I am willing to sacrifice that little effort to be able to clean the seals easily. The tea infuser is a nice feature, although I use tea bags so I can't review on how well the screen filters. Overall, very happy with this mug and will be buying another in the near future, possibly the 16oz (no tea infuser).  I highly recommend this mug!

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


<think>
Answer: A: very positive