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.

[Q]: Question: Does interaction of programmed death-1 and programmed death-1 ligand-1 contribute to testicular immune privilege?
Answer: The constitutive expression of PD-L1 in the testis is an important mechanism underlying testicular immune privilege and long-term survival of intratesticular islet allografts.
[A]: yes


[Q]: Question: Does revaccination with Bacillus Calmette-Guerin ( BCG ) vaccine reduce morbidity from malaria in African children?
Answer: We found no evidence that BCG revaccination reduces morbidity from malaria.
[A]: no


[Q]: Question: Are human polyomaviruses 6 and 7 detectable in Merkel cell polyomavirus-negative Merkel cell carcinoma?
Answer: While MCPyV, HPyV6, and HPyV7 are part of normal skin flora and show a high degree of sequence similarity, there is no evidence of an association between HPyV6 and HPyV7 and MCC in this case series. This result argues against a role for HPyV6 and HPyV7 in the pathogenesis of MCPyV-negative MCC.
[A]:
no