Instruction: Determine the sentiment expressed by the user in her review from the provided choices, and respond by selecting one of the available options.

Input:
I purchased this thermos to brew green and oolong tea with. It does exactly what it claims to do and keeps my tea and coffee nice and hot for what seems like forever. However, the thermos that I received leaks a lot. I'll tilt the thermos to drink from it, and it'll get all over my clothes, sheets and even keyboard. I've had to be very careful when I drink from this thermos. I'm not sure if the model that I received is defective, but at the price point, it's not worth going through the hassle to exchange.

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