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 bone mineral density vary as a function of the rate of joint space narrowing in the hip?
Answer: Patients with a rapid rate of JSN of the asymptomatic hip after unilateral THR are characterized by elevated local and remote BMD. The local elevation in BMD implies that increased local bone density may contribute to or serve as a marker for increased risk of development of OA (assuming that JSN can be used as a predictive marker). The presence of elevated BMD in the spine suggests that there are systemic as well as local aspects of OA pathogenesis, at least in patients with one THR and rapid JSN in the contralateral hip.

Ex Output:
yes


Ex Input:
Question: Is vincristine-induced neuropathy in the rat modified by drug-drug interactions with the P-glycoprotein inhibitor verapamil?
Answer: Behavioral pain tests did not reveal an increase in vincristine neurotoxicity following combination treatment with verapamil and vincristine. This regimen only led to a slight increase in general toxicity.

Ex Output:
no


Ex Input:
Question: Does conservative antibiotic policy in patients undergoing non-trauma cranial surgery result in higher rates of postoperative meningitis : an audit of nine years of narrow-spectrum prophylaxis?
Answer: In non-trauma neurosurgical patients undergoing elective cranial procedures, a conservative prophylactic antibiotic policy is effective in achieving low rates of bacterial meningitis with low rates of MDR infections. Therefore, our results make a compelling case for a conservative prophylactic antibiotic policy.

Ex Output:

no