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 a novel biomechanical device improve gait pattern in patient with chronic nonspecific low back pain?
Answer: Patients with NSLBP treated with the novel biomechanical device for 3 months increased walking speed through longer step length and eliminated asymmetrical differences.

Ex Output:
yes

Ex Input:
Question: Does high expression of Cullin1 indicate poor prognosis for NSCLC patients?
Answer: These data suggested that Cullin1 might promote the progression of NSCLC and be a biotarget for NSCLC's therapy.

Ex Output:
yes

Ex Input:
Question: Do retinal vascular occlusions occur more frequently in the more affected eye in exfoliation syndrome?
Answer: Retinal vascular occlusion in patients with XFS occurs most often in the affected or more severely affected eye. As vascular occlusions happened in patients with and without glaucoma in similar proportions, the presence of XFS seems to play an important role in these findings.

Ex Output:
yes