Given a passage with a question and an answer to that question, classify if the answer actually answers the question into 'yes' or 'no'. Output 'yes' if the answer answers the question and output 'no' if the answer does not answer the question.

Ex Input:
Question: Does degenerative spondylolisthesis affect the outcome of unilateral laminotomy with bilateral decompression in patients with lumbar stenosis?
Answer: Our study thus indicates that preoperative degenerative spondylolisthesis does not worsen the outcome of patients with lumbar stenosis undergoing unilateral laminotomy with bilateral decompression. These results suggest that lumbar fusion is often unnecessary in patients with degenerative spondylolisthesis and lumbar stenosis if the posterior decompression technique is unilateral laminotomy with bilateral decompression.

Ex Output:
no


Ex Input:
Question: Is arthrogenic muscle inhibition present in the limb contralateral to a simulated knee joint effusion?
Answer: Knee joint effusion results in ipsilateral but not contralateral impairment of quadriceps function. Rehabilitation protocols after knee joint injury should focus on ipsilateral neuromuscular and mechanical alterations that occur as the result of joint damage.

Ex Output:
no


Ex Input:
Question: Is soluble Nogo-A in CSF a useful biomarker for multiple sclerosis?
Answer: A 25 kD band is detectable on Western blots stained with Nogo-A antibody in almost all CSF specimens, but is darker in MS specimens. Our results suggest this band is immunoglobulin light chains rather than Nogo-A. It is not likely to be a useful biomarker for multiple sclerosis.

Ex Output:

no