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

Input:
I received this thermometer as a stocking stuffer and initially,I was enthusiastic since I like to barbeque and the analog models I had were not instant response.

Unfortunately, this unit was no improvement. It might be instant response but it was rarely accurate. In a number of instances, the variation in temperature between this unit and my old thermometers was greater than 20 degrees although calibration of each unit happened at the same time.

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