Detailed Instructions: 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: Do the diameters of the human retinal branch vessels change in darkness?
Answer: The small changes of retinal branch vessel diameters under different light conditions probably have little influence on the possible changes of retinal blood flow in healthy subjects.
A:
no