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: Carefully assess the user's review for any strong expressions of sentiment, either positive or negative. Based on your analysis, select the most fitting sentiment option from the provided list as output.

Input:
User Review: The SP50 is a good basic CD/MP3 player without alot of bells and whistles. The player includes a headphone jack, line out jack, rotary volume control, a slide switch to open the player, a enhanced bass/normal selector and a key lock to lock the controls on the top of the unit. The unit has 8 keys on top for operation. I only use four of them as the other four get you into the menu's to search and program tracks and unless I have the instructions it's just to much of a pain to figure out. The unit is shipped with battaries (chinese ones that don't last very long compared to normal alkaline's) and some ear buds that you might as well toss. I have no problems playing my burned CD's on this player. All of my files are at 128K and have been created with Misicmatch Jukebox ver 7.2. The display shows the artist and song on the display and is supposed to show the album but the album info comes up blank on mine. Sound quality with a decent set of headphones is good. Regular CD/s have played fine as well. I have not had any problems with skipping even when attempting to make it do so. ... I've deducted a star for non intiutive search controls, junky earbuds and the fact that the album title doesn't display.

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


<think>
Answer: B: positive