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.

Example Input: Question: Does switching types of drug-eluting stents prevent repeated in-stent restenosis in patients with coronary drug-eluting stent restenosis?
Answer: A strategy involving repeated DES implantation was superior to POBA for preventing recurrent restenosis. Treatment with a different type or generation of DES does not appear to reduce the incidence of TLR. Moreover, we identified certain useful factors for facilitating appropriate and early triage in the patients with repeated DES ISR.
Example Output: no

Example Input: Question: Is allocentric but not egocentric orientation impaired during normal aging : an ERP study?
Answer: These results suggest that elderly individuals present with deficits when spatial orientation relies on allocentric representation, and are associated with age-related deficits in spatial attention.
Example Output: yes

Example Input: Question: Are bronchoalveolar lavage cellular profiles in patients with systemic sclerosis-associated interstitial lung disease predictive of disease progression?
Answer: BAL findings provide only limited prognostic information in SSc-ILD. Neutrophilia on BAL is linked to early mortality, but BAL findings are not linked to long-term survival or the rapidity of progression of lung disease. The usefulness of BAL to define alveolitis in SSc is questionable.
Example Output:
no