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: Is tobacco smoking associated with decreased semen quality?
Answer: Results demonstrated a decline in semen quality in a dose dependent tobacco smoking manner.
[A]: yes


[Q]: Question: Does clinical presentation and disease course of inflammatory bowel disease differ by race in a large tertiary care hospital?
Answer: We identified significant differences in disease characteristics and extraintestinal manifestations between AA and Ca IBD patients in a large tertiary care population. These results have implications for future genotype-phenotype studies.
[A]: yes


[Q]: Question: Are anterior and posterior cervical fusion in patients with high body mass index associated with greater complications?
Answer: High BMI, regardless of obesity class, does not appear to be associated with increased complications after cervical fusion in the 30-day postoperative period.
[A]:
no