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

Input:
Great concept.  We bought it to help teach our 4 year old left-handed son (as we're both right-handers).  But it only holds air for a few hours at a time.  Total dud.

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